- dovecot - dovecot.org

TFA authentication in dovecot, using XMPP and RFC 4226
by André Rodier 03 Apr '19

03 Apr '19

Hello, I would like to implement some kind of two factors authentication, in Dovecot. I am thinking about using the post login script, to check for unusual behaviour, like say, a different country / IP address or an unusual hour. I already wrote a simple shell script that check these factors, but now, I have some options for the following, and I need to know your opinion if this is feasible or not. I want to use google authenticator Debian package (support the HMAC- Based One-time Password (HOTP) algorithm specified in RFC 4226 and the Time-based One-time Password (TOTP)) The challenge would be send via XMPP. This second part is fairly easy to do, I have all the packages on Debian, for instance sendxmpp. The first tests are promising. In case of success, the IP address is added to the list, let's say for one month... My back-end for authentication is OpenLDAP. My questions are: - Do you see any performance issues for other users or login processes, if I implement this? - I am planning to use a timeout, for instance one minute to confirm the connection. Does Dovecot have a timeout on its side, that would abort the connection before? Otherwise: - Is it possible to have multiple authentication back-ends in Dovecot? For instance LDAP and/or OTP? - I think to have seen some TFA options in Dovecot, but AFAICS, they are mandatory. Thanks for your insights, and this fabulous software. -- André Rodier HomeBox: https://github.com/progmaticltd/homebox

2 1

where shall I enforce sieve and quota plugins
by luckydog xf 03 Apr '19

03 Apr '19

Hello, guys, I'm going to using sieve and quota plugins, but I'm not sure where shall I enforce against properly? I see somebody uses them against 20-imap.conf, 15-lda.conf, or 20-lmtp.conf I use LMTP as MDA, so where is the correct location to call these plugins and why? Thanks,

2 1

Trying to track down source of duplicate messages
by Alex 02 Apr '19

02 Apr '19

Hi, I have a fedora28 system with dovecot-2.3.5 and I'm trying to figure out why I'm increasingly receiving duplicate emails. The message IDs are exactly the same. It's always two of the same messages. I don't think it's ever occurred in the inbox. It doesn't happen with every message or seemingly in every folder. I've read about dovecot deduplicate, but of course I want to prevent them from being duplicated in the first place. It's also happening much more frequently now. Could something in my configuration cause this problem? Below is the contents of my doveconf # 2.3.5 (513208660): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.5 (2483b085) # OS: Linux 4.20.11-100.fc28.x86_64 x86_64 Fedora release 28 (Twenty Eight) # Hostname: orion.inside.guardiandigital.com # NOTE: Send doveconf -n output instead when asking for help. auth_anonymous_username = anonymous auth_cache_negative_ttl = 1 hours auth_cache_size = 0 auth_cache_ttl = 1 hours auth_cache_verify_password_with_worker = no auth_debug = no auth_debug_passwords = no auth_default_realm = auth_failure_delay = 2 secs auth_gssapi_hostname = auth_krb5_keytab = auth_master_user_separator = auth_mechanisms = plain auth_policy_check_after_auth = yes auth_policy_check_before_auth = yes auth_policy_hash_mech = sha256 auth_policy_hash_nonce = auth_policy_hash_truncate = 12 auth_policy_log_only = no auth_policy_reject_on_fail = no auth_policy_report_after_auth = yes auth_policy_request_attributes = login=%{requested_username} pwhash=%{hashed_password} remote=%{rip} device_id=%{client_id} protocol=%s auth_policy_server_api_header = auth_policy_server_timeout_msecs = 2000 auth_policy_server_url = auth_proxy_self = auth_realms = auth_socket_path = auth-userdb auth_ssl_require_client_cert = no auth_ssl_username_from_cert = no auth_stats = no auth_use_winbind = no auth_username_chars = abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@ auth_username_format = %Lu auth_username_translation = auth_verbose = no auth_verbose_passwords = no auth_winbind_helper_path = /usr/bin/ntlm_auth auth_worker_max_count = 30 base_dir = /var/run/dovecot config_cache_size = 1 M debug_log_path = default_client_limit = 1000 default_idle_kill = 1 mins default_internal_group = dovecot default_internal_user = dovecot default_login_user = dovenull default_process_limit = 100 default_vsz_limit = 256 M deliver_log_format = msgid=%m: %$ dict_db_config = director_flush_socket = director_mail_servers = director_max_parallel_kicks = 100 director_max_parallel_moves = 100 director_output_buffer_size = 10 M director_ping_idle_timeout = 30 secs director_ping_max_timeout = 1 mins director_servers = director_user_expire = 15 mins director_user_kick_delay = 2 secs director_username_hash = %u disable_plaintext_auth = yes dotlock_use_excl = yes doveadm_allowed_commands = doveadm_api_key = doveadm_http_rawlog_dir = doveadm_password = doveadm_port = 0 doveadm_socket_path = doveadm-server doveadm_username = doveadm doveadm_worker_count = 0 dsync_alt_char = _ dsync_commit_msgs_interval = 100 dsync_features = dsync_hashed_headers = Date Message-ID dsync_remote_cmd = ssh -l%{login} %{host} doveadm dsync-server -u%u -U first_valid_gid = 1 first_valid_uid = 500 haproxy_timeout = 3 secs haproxy_trusted_networks = hostname = imap_capability = imap_client_workarounds = imap_fetch_failure = disconnect-immediately imap_hibernate_timeout = 0 imap_id_log = imap_id_retain = no imap_id_send = name * imap_idle_notify_interval = 2 mins imap_literal_minus = no imap_logout_format = in=%i out=%o deleted=%{deleted} expunged=%{expunged} trashed=%{trashed} hdr_count=%{fetch_hdr_count} hdr_bytes=%{fetch_hdr_bytes} body_count=%{fetch_body_count} body_bytes=%{fetch_body_bytes} imap_max_line_length = 64 k imap_metadata = no imap_urlauth_host = imap_urlauth_logout_format = in=%i out=%o imap_urlauth_port = 143 imapc_cmd_timeout = 5 mins imapc_connection_retry_count = 1 imapc_connection_retry_interval = 1 secs imapc_features = imapc_host = imapc_list_prefix = imapc_master_user = imapc_max_idle_time = 29 mins imapc_max_line_length = 0 imapc_password = imapc_port = 143 imapc_rawlog_dir = imapc_sasl_mechanisms = imapc_ssl = no imapc_ssl_verify = yes imapc_user = import_environment = TZ CORE_OUTOFMEM CORE_ERROR LISTEN_PID LISTEN_FDS info_log_path = instance_name = dovecot last_valid_gid = 0 last_valid_uid = 0 lda_mailbox_autocreate = no lda_mailbox_autosubscribe = no lda_original_recipient_header = libexec_dir = /usr/libexec/dovecot listen = *, :: lmtp_hdr_delivery_address = final lmtp_proxy = no lmtp_proxy_rawlog_dir = lmtp_rawlog_dir = lmtp_rcpt_check_quota = no lmtp_save_to_detail_mailbox = no lmtp_user_concurrency_limit = 0 lock_method = fcntl log_core_filter = log_debug = log_path = syslog log_timestamp = "%b %d %H:%M:%S " login_access_sockets = login_greeting = Dovecot ready. login_log_format = %$: %s login_log_format_elements = user=<%u> method=%m rip=%r lip=%l mpid=%e %c session=<%{session}> login_plugin_dir = /usr/lib64/dovecot/login login_plugins = login_proxy_max_disconnect_delay = 0 login_proxy_notify_path = proxy-notify login_source_ips = login_trusted_networks = mail_access_groups = mail_always_cache_fields = mail_attachment_detection_options = mail_attachment_dir = mail_attachment_fs = sis posix mail_attachment_hash = %{sha1} mail_attachment_min_size = 128 k mail_attribute_dict = mail_cache_compress_continued_percentage = 200 mail_cache_compress_delete_percentage = 20 mail_cache_compress_header_continue_count = 4 mail_cache_compress_min_size = 32 k mail_cache_fields = flags mail_cache_min_mail_count = 0 mail_cache_record_max_size = 64 k mail_cache_unaccessed_field_drop = 30 days mail_chroot = mail_debug = no mail_fsync = optimized mail_full_filesystem_access = no mail_gid = mail mail_home = mail/ mail_index_log2_max_age = 2 days mail_index_log_rotate_max_size = 1 M mail_index_log_rotate_min_age = 5 mins mail_index_log_rotate_min_size = 32 k mail_index_rewrite_max_log_bytes = 128 k mail_index_rewrite_min_log_bytes = 8 k mail_location = mbox:~/mail:INBOX=/var/spool/mail/%u mail_log_prefix = "%s(%u)<%{pid}><%{session}>: " mail_max_keyword_length = 50 mail_max_lock_timeout = 0 mail_max_userip_connections = 500 mail_never_cache_fields = imap.envelope mail_nfs_index = no mail_nfs_storage = no mail_plugin_dir = /usr/lib64/dovecot mail_plugins = " listescape" mail_prefetch_count = 0 mail_privileged_group = mail mail_save_crlf = no mail_server_admin = mail_server_comment = mail_shared_explicit_inbox = no mail_sort_max_read_count = 0 mail_temp_dir = /tmp mail_temp_scan_interval = 1 weeks mail_uid = mail_vsize_bg_after_count = 0 mailbox_idle_check_interval = 30 secs mailbox_list_index = yes mailbox_list_index_include_inbox = no mailbox_list_index_very_dirty_syncs = no maildir_broken_filename_sizes = no maildir_copy_with_hardlinks = yes maildir_empty_new = no maildir_stat_dirs = no maildir_very_dirty_syncs = no managesieve_client_workarounds = managesieve_implementation_string = Dovecot Pigeonhole managesieve_logout_format = bytes=%i/%o managesieve_max_compile_errors = 5 managesieve_max_line_length = 65536 managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext master_user_separator = mbox_dirty_syncs = yes mbox_dotlock_change_timeout = 2 mins mbox_lazy_writes = yes mbox_lock_timeout = 5 mins mbox_md5 = apop3d mbox_min_index_size = 0 mbox_read_locks = fcntl mbox_very_dirty_syncs = no mbox_write_locks = fcntl mdbox_preallocate_space = no mdbox_rotate_interval = 0 mdbox_rotate_size = 10 M mmap_disable = no namespace inbox { disabled = no hidden = no ignore_on_failure = no inbox = yes list = yes location = mailbox Drafts { auto = no autoexpunge = 0 autoexpunge_max_mails = 0 comment = driver = special_use = \Drafts } mailbox Junk { auto = no autoexpunge = 0 autoexpunge_max_mails = 0 comment = driver = special_use = \Junk } mailbox Sent { auto = no autoexpunge = 0 autoexpunge_max_mails = 0 comment = driver = special_use = \Sent } mailbox "Sent Messages" { auto = no autoexpunge = 0 autoexpunge_max_mails = 0 comment = driver = special_use = \Sent } mailbox Trash { auto = no autoexpunge = 0 autoexpunge_max_mails = 0 comment = driver = special_use = \Trash } order = 0 prefix = separator = subscriptions = yes type = private } old_stats_carbon_interval = 30 secs old_stats_carbon_name = old_stats_carbon_server = old_stats_command_min_time = 1 mins old_stats_domain_min_time = 12 hours old_stats_ip_min_time = 12 hours old_stats_memory_limit = 16 M old_stats_session_min_time = 15 mins old_stats_user_min_time = 1 hours passdb { args = auth_verbose = default default_fields = deny = no driver = pam master = no mechanisms = name = override_fields = pass = no result_failure = continue result_internalfail = continue result_success = return-ok skip = never username_filter = } passdb { args = auth_verbose = default default_fields = deny = no driver = pam master = no mechanisms = name = override_fields = pass = no result_failure = continue result_internalfail = continue result_success = return-ok skip = never username_filter = } pop3_client_workarounds = pop3_delete_type = default pop3_deleted_flag = pop3_enable_last = no pop3_fast_size_lookups = no pop3_lock_session = no pop3_logout_format = top=%t/%p, retr=%r/%b, del=%d/%m, size=%s pop3_no_flag_updates = no pop3_reuse_xuidl = no pop3_save_uidl = no pop3_uidl_duplicates = allow pop3_uidl_format = %08Xu%08Xv pop3c_features = pop3c_host = pop3c_master_user = pop3c_password = pop3c_port = 110 pop3c_quick_received_date = no pop3c_rawlog_dir = pop3c_ssl = no pop3c_ssl_verify = yes pop3c_user = %u postmaster_address = postmaster@%{if;%d;ne;;%d;%{hostname}} protocols = imap pop3 quota_full_tempfail = no rawlog_dir = recipient_delimiter = + rejection_reason = Your message to <%t> was automatically rejected:%n%r rejection_subject = Rejected: %s replication_dsync_parameters = -d -N -l 30 -U replication_full_sync_interval = 1 days replication_max_conns = 10 replicator_host = replicator replicator_port = 0 sendmail_path = /usr/sbin/sendmail service aggregator { chroot = . client_limit = 0 drop_priv_before_exec = no executable = aggregator extra_groups = fifo_listener replication-notify-fifo { group = mode = 0600 user = } group = idle_kill = 0 privileged_group = process_limit = 0 process_min_avail = 0 protocol = service_count = 0 type = unix_listener replication-notify { group = mode = 0600 user = } user = $default_internal_user vsz_limit = 18446744073709551615 B } service anvil { chroot = empty client_limit = 0 drop_priv_before_exec = no executable = anvil extra_groups = group = idle_kill = 4294967295 secs privileged_group = process_limit = 1 process_min_avail = 1 protocol = service_count = 0 type = anvil unix_listener anvil-auth-penalty { group = mode = 0600 user = } unix_listener anvil { group = mode = 0600 user = } user = $default_internal_user vsz_limit = 18446744073709551615 B } service auth-worker { chroot = client_limit = 1 drop_priv_before_exec = no executable = auth -w extra_groups = group = idle_kill = 0 privileged_group = process_limit = 0 process_min_avail = 0 protocol = service_count = 1 type = unix_listener auth-worker { group = mode = 0600 user = $default_internal_user } user = vsz_limit = 18446744073709551615 B } service auth { chroot = client_limit = 0 drop_priv_before_exec = no executable = auth extra_groups = group = idle_kill = 0 privileged_group = process_limit = 1 process_min_avail = 0 protocol = service_count = 0 type = unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } unix_listener auth-client { group = mode = 0600 user = $default_internal_user } unix_listener auth-login { group = mode = 0600 user = $default_internal_user } unix_listener auth-master { group = mode = 0600 user = } unix_listener auth-userdb { group = mode = 0666 user = $default_internal_user } unix_listener login/login { group = mode = 0666 user = } unix_listener token-login/tokenlogin { group = mode = 0666 user = } user = $default_internal_user vsz_limit = 18446744073709551615 B } service config { chroot = client_limit = 0 drop_priv_before_exec = no executable = config extra_groups = group = idle_kill = 4294967295 secs privileged_group = process_limit = 0 process_min_avail = 0 protocol = service_count = 0 type = config unix_listener config { group = mode = 0600 user = } user = vsz_limit = 18446744073709551615 B } service dict-async { chroot = client_limit = 0 drop_priv_before_exec = no executable = dict extra_groups = group = idle_kill = 0 privileged_group = process_limit = 0 process_min_avail = 0 protocol = service_count = 0 type = unix_listener dict-async { group = $default_internal_group mode = 0660 user = } user = $default_internal_user vsz_limit = 18446744073709551615 B } service dict { chroot = client_limit = 1 drop_priv_before_exec = no executable = dict extra_groups = group = idle_kill = 0 privileged_group = process_limit = 0 process_min_avail = 0 protocol = service_count = 0 type = unix_listener dict { group = $default_internal_group mode = 0660 user = } user = $default_internal_user vsz_limit = 18446744073709551615 B } service director { chroot = . client_limit = 0 drop_priv_before_exec = no executable = director extra_groups = fifo_listener login/proxy-notify { group = mode = 00 user = } group = idle_kill = 4294967295 secs privileged_group = process_limit = 1 process_min_avail = 0 protocol = service_count = 0 type = unix_listener director-admin { group = mode = 0600 user = } unix_listener login/director { group = mode = 00 user = } user = $default_internal_user vsz_limit = 18446744073709551615 B } service dns_client { chroot = client_limit = 1 drop_priv_before_exec = no executable = dns-client extra_groups = group = idle_kill = 0 privileged_group = process_limit = 0 process_min_avail = 0 protocol = service_count = 0 type = unix_listener dns-client { group = mode = 0666 user = } user = $default_internal_user vsz_limit = 18446744073709551615 B } service doveadm { chroot = client_limit = 1 drop_priv_before_exec = no executable = doveadm-server extra_groups = $default_internal_group group = idle_kill = 0 privileged_group = process_limit = 0 process_min_avail = 0 protocol = service_count = 1 type = unix_listener doveadm-server { group = mode = 0600 user = } user = vsz_limit = 18446744073709551615 B } service imap-hibernate { chroot = client_limit = 0 drop_priv_before_exec = no executable = imap-hibernate extra_groups = group = idle_kill = 0 privileged_group = process_limit = 0 process_min_avail = 0 protocol = imap service_count = 0 type = unix_listener imap-hibernate { group = $default_internal_group mode = 0660 user = } user = $default_internal_user vsz_limit = 18446744073709551615 B } service imap-login { chroot = login client_limit = 0 drop_priv_before_exec = no executable = imap-login extra_groups = group = idle_kill = 0 inet_listener imap { address = haproxy = no port = 0 reuse_port = no ssl = no } inet_listener imaps { address = haproxy = no port = 993 reuse_port = no ssl = yes } privileged_group = process_limit = 0 process_min_avail = 20 protocol = imap service_count = 0 type = login user = $default_login_user vsz_limit = 18446744073709551615 B } service imap-urlauth-login { chroot = token-login client_limit = 0 drop_priv_before_exec = no executable = imap-urlauth-login extra_groups = group = idle_kill = 0 privileged_group = process_limit = 0 process_min_avail = 0 protocol = imap service_count = 1 type = login unix_listener imap-urlauth { group = mode = 0666 user = } user = $default_login_user vsz_limit = 18446744073709551615 B } service imap-urlauth-worker { chroot = client_limit = 1 drop_priv_before_exec = no executable = imap-urlauth-worker extra_groups = $default_internal_group group = idle_kill = 0 privileged_group = process_limit = 1024 process_min_avail = 0 protocol = imap service_count = 1 type = unix_listener imap-urlauth-worker { group = mode = 0600 user = $default_internal_user } user = vsz_limit = 18446744073709551615 B } service imap-urlauth { chroot = client_limit = 1 drop_priv_before_exec = no executable = imap-urlauth extra_groups = group = idle_kill = 0 privileged_group = process_limit = 1024 process_min_avail = 0 protocol = imap service_count = 1 type = unix_listener token-login/imap-urlauth { group = mode = 0666 user = } user = $default_internal_user vsz_limit = 18446744073709551615 B } service imap { chroot = client_limit = 1 drop_priv_before_exec = no executable = imap extra_groups = $default_internal_group group = idle_kill = 0 privileged_group = process_limit = 1024 process_min_avail = 0 protocol = imap service_count = 1 type = unix_listener imap-master { group = mode = 0600 user = } unix_listener login/imap { group = mode = 0666 user = } user = vsz_limit = 18446744073709551615 B } service indexer-worker { chroot = client_limit = 1 drop_priv_before_exec = no executable = indexer-worker extra_groups = $default_internal_group group = idle_kill = 0 privileged_group = process_limit = 10 process_min_avail = 0 protocol = service_count = 0 type = unix_listener indexer-worker { group = mode = 0600 user = $default_internal_user } user = vsz_limit = 18446744073709551615 B } service indexer { chroot = client_limit = 0 drop_priv_before_exec = no executable = indexer extra_groups = group = idle_kill = 0 privileged_group = process_limit = 1 process_min_avail = 0 protocol = service_count = 0 type = unix_listener indexer { group = mode = 0666 user = } user = $default_internal_user vsz_limit = 18446744073709551615 B } service ipc { chroot = empty client_limit = 0 drop_priv_before_exec = no executable = ipc extra_groups = group = idle_kill = 0 privileged_group = process_limit = 1 process_min_avail = 0 protocol = service_count = 0 type = unix_listener ipc { group = mode = 0600 user = $default_internal_user } unix_listener login/ipc-proxy { group = mode = 0600 user = $default_login_user } user = $default_internal_user vsz_limit = 18446744073709551615 B } service lmtp { chroot = client_limit = 1 drop_priv_before_exec = no executable = lmtp extra_groups = $default_internal_group group = idle_kill = 0 privileged_group = process_limit = 0 process_min_avail = 0 protocol = lmtp service_count = 0 type = unix_listener lmtp { group = mode = 0666 user = } user = vsz_limit = 18446744073709551615 B } service log { chroot = client_limit = 0 drop_priv_before_exec = no executable = log extra_groups = group = idle_kill = 4294967295 secs privileged_group = process_limit = 1 process_min_avail = 0 protocol = service_count = 0 type = log unix_listener log-errors { group = mode = 0600 user = } user = vsz_limit = 18446744073709551615 B } service managesieve-login { chroot = login client_limit = 0 drop_priv_before_exec = no executable = managesieve-login extra_groups = group = idle_kill = 0 inet_listener sieve { address = haproxy = no port = 4190 reuse_port = no ssl = no } privileged_group = process_limit = 0 process_min_avail = 0 protocol = sieve service_count = 1 type = login user = $default_login_user vsz_limit = 18446744073709551615 B } service managesieve { chroot = client_limit = 1 drop_priv_before_exec = no executable = managesieve extra_groups = group = idle_kill = 0 privileged_group = process_limit = 0 process_min_avail = 0 protocol = sieve service_count = 1 type = unix_listener login/sieve { group = mode = 0666 user = } user = vsz_limit = 18446744073709551615 B } service old-stats { chroot = empty client_limit = 0 drop_priv_before_exec = no executable = old-stats extra_groups = fifo_listener old-stats-mail { group = mode = 0600 user = } fifo_listener old-stats-user { group = mode = 0600 user = } group = idle_kill = 4294967295 secs privileged_group = process_limit = 1 process_min_avail = 0 protocol = service_count = 0 type = unix_listener old-stats { group = mode = 0600 user = } user = $default_internal_user vsz_limit = 18446744073709551615 B } service pop3-login { chroot = login client_limit = 0 drop_priv_before_exec = no executable = pop3-login extra_groups = group = idle_kill = 0 inet_listener pop3 { address = haproxy = no port = 0 reuse_port = no ssl = no } inet_listener pop3s { address = 192.168.1.100 haproxy = no port = 995 reuse_port = no ssl = yes } privileged_group = process_limit = 0 process_min_avail = 0 protocol = pop3 service_count = 1 type = login user = $default_login_user vsz_limit = 18446744073709551615 B } service pop3 { chroot = client_limit = 1 drop_priv_before_exec = no executable = pop3 extra_groups = $default_internal_group group = idle_kill = 0 privileged_group = process_limit = 1024 process_min_avail = 0 protocol = pop3 service_count = 1 type = unix_listener login/pop3 { group = mode = 0666 user = } user = vsz_limit = 18446744073709551615 B } service replicator { chroot = client_limit = 0 drop_priv_before_exec = no executable = replicator extra_groups = group = idle_kill = 4294967295 secs privileged_group = process_limit = 1 process_min_avail = 0 protocol = service_count = 0 type = unix_listener replicator-doveadm { group = mode = 00 user = $default_internal_user } unix_listener replicator { group = mode = 0600 user = $default_internal_user } user = vsz_limit = 18446744073709551615 B } service stats { chroot = empty client_limit = 0 drop_priv_before_exec = no executable = stats extra_groups = group = idle_kill = 4294967295 secs privileged_group = process_limit = 1 process_min_avail = 0 protocol = service_count = 0 type = unix_listener stats-reader { group = mode = 0600 user = } unix_listener stats-writer { group = $default_internal_group mode = 0660 user = } user = $default_internal_user vsz_limit = 18446744073709551615 B } service submission-login { chroot = login client_limit = 0 drop_priv_before_exec = no executable = submission-login extra_groups = group = idle_kill = 0 inet_listener submission { address = haproxy = no port = 587 reuse_port = no ssl = no } privileged_group = process_limit = 0 process_min_avail = 0 protocol = submission service_count = 1 type = login user = $default_login_user vsz_limit = 18446744073709551615 B } service submission { chroot = client_limit = 1 drop_priv_before_exec = no executable = submission extra_groups = $default_internal_group group = idle_kill = 0 privileged_group = process_limit = 1024 process_min_avail = 0 protocol = submission service_count = 1 type = unix_listener login/submission { group = mode = 0666 user = } user = vsz_limit = 18446744073709551615 B } shutdown_clients = yes ssl = yes ssl_alt_cert = ssl_alt_key = ssl_ca = ssl_cert = </etc/letsencrypt/fullchain.pem ssl_cert_username_field = commonName ssl_cipher_list = ALL:!LOW:!EXP:!aNULL:!RC4::!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS ssl_client_ca_dir = ssl_client_ca_file = ssl_client_cert = ssl_client_key = ssl_crypto_device = ssl_curve_list = ssl_dh = # hidden, use -P to show it ssl_key = # hidden, use -P to show it ssl_key_password = ssl_min_protocol = TLSv1 ssl_options = ssl_prefer_server_ciphers = yes ssl_require_crl = yes ssl_verify_client_cert = no state_dir = /var/lib/dovecot stats_writer_socket_path = stats-writer submission_client_workarounds = submission_host = submission_logout_format = in=%i out=%o submission_max_mail_size = 40 M submission_max_recipients = 0 submission_relay_command_timeout = 5 mins submission_relay_connect_timeout = 30 secs submission_relay_host = submission_relay_master_user = submission_relay_max_idle_time = 29 mins submission_relay_password = submission_relay_port = 25 submission_relay_rawlog_dir = submission_relay_ssl = no submission_relay_ssl_verify = yes submission_relay_trusted = no submission_relay_user = submission_ssl = no submission_timeout = 30 secs syslog_facility = mail userdb { args = auth_verbose = default default_fields = driver = passwd name = override_fields = result_failure = continue result_internalfail = continue result_success = return-ok skip = never } userdb { args = auth_verbose = default default_fields = driver = passwd name = override_fields = result_failure = continue result_internalfail = continue result_success = return-ok skip = never } valid_chroot_dirs = verbose_proctitle = no verbose_ssl = no version_ignore = no

4 4

ssl_min_protocol
by ＠lbutlr 02 Apr '19

02 Apr '19

What are the possible settings for ssl_min_protocol? I only see it on the upgrade page where it mentions the default is TLSv1. Searching on the dovecot page gives me "Your search query "ssl_min_protocol" didn't return any results." -- Up the airy mountains, down the rushy glen... From ghosties and bogles and long-leggity beasties... My mother said I never should... We dare not go a-hunting for fear... And things that go bump... Play with the fairies in the wood... --Lords and Ladies

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sql table definitions
by Richard Hector 02 Apr '19

02 Apr '19

Hi all, Trivial question ... I'm using PostgreSQL for my auth db. I used the example CREATE TABLE statement in the config file, but now I find the fields are too short. I assume dovecot will be fine with 'text' type columns replacing the varchars? Or failing that, I can change the length of the varchar fields? Cheers, Richard

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Issue with dovecot/director
by Nico Stöckigt 01 Apr '19

01 Apr '19

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Hi, are there any known issues with dovecot/director (2.2.13) when receiving e-an mail with multiple receivers? In the given scenario the e-mail contains 3 recipients and is redirected by the director to 3 different mail servers (ox/dovecot @ UCS/univention). In this process the first 2 e-mails are just fine but the third e-mail is truncated somewhere in or after the header. Kind Regards Nico Stöckigt - -- Nico Stöckigt <stoeckigt(a)univention.de> Support Univention -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEoGjDpba412f0rm1CjVdPG/rdoykFAlyiPGoACgkQjVdPG/rd oyl+IRAAp11JHenIkDeonGV+tbj3nFF4RigPp85TiJmD2l/kddP5mMR/Bw+vMAc6 taHjfS4Myf6v+jCrn+FS+C2isZaassnqZF1JcyllT5RSvxzrSKl6ojf9vVl3jyfu gZ7RlVOqBqskSHkVsT4fmzFuGMRaTQBN7CtgQH3MXPcN477060WDiZ11x+w+2+be eI0hQID3X3CBRmhaYyXMsgwUCHF36dVYlzEnUy6yge2FuwgwonZASC9xueVQGN5b KYf66LmubJTERGo3XK7454s3jM6oEiz731Os7g/zHyd8X6fgpCaR1nre8x0xfe1I bz86GJzm3b+1Fme8++yxlGhTEERtNkw0znQG7LOw8fqY5ctD12kdxBgXQOgcLkjh 98zJD44wC8y9lRKfZ3Lydfq768U3D47AjmPY0u9Zp1YKdNS8PEsNk0iHaRn5ZpT0 0V+wfTTkh3jFFuaqqd0hgamwRuwkNfFNyGvNAd5x4nMUIGUZ1pI3ikGP8oGaLDMs iSo1YxXkUojZ9A2xMQ8bDbWLjpyj/YYw+Cs6t1QcP0h2HDATc7QrHMO02ajKXDW+ ZxsI4VvEplv4GhbMuhavRYhZk01fI1hdeV1+PvkcAsqxaljoJDSyqZP78A81f7F4 DWComweyk/k+BzLjiQPKhv7AjaXnjDVeJfVxLl8VYoW4jD/4aFc= =MGL8 -----END PGP SIGNATURE-----

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mail_crypt not working on incoming messages?
by Dave 01 Apr '19

01 Apr '19

[Dovecot v2.2.33.2] I'm testing out mail_crypt on a fresh Dovecot install to get a feel for how it works, but I'm running into something unexpected. The mail_crypt plugin does seem to be working, but NOT on incoming email. What I mean is, if I send a test email to the server that has Dovecot installed, the message correctly arrives in the user's Maildir folder (I'm using Maildir format, not mbox), as I can see the mail message file appear. However, the message file is in plaintext and is not encrypted. But, if, using my Thunderbird email client connected to that account via IMAP, I move that message out of the inbox of that account to a folder on another account, and then move it back in to the original inbox, the file that appears in the Maildir folder structure IS encrypted. I have confirmed that mail_crypt is active in 10-mail.conf, 20-imap.conf, and 20-pop3.conf. The global public and private keys are working because (a) there are no errors and (b) it DOES encrypt -- just not on incoming email. mail_crypt_save_version is set 2, as per the docs for Dovecot 2 instruct. What am I missing? Does anyone have any thoughts as to why JUST incoming messages aren't encrypted, but that messages moved into the IMAP account DO get encrypted? Did I set up something incorrectly? I'm using sendmail as the MTA, if that matters, and messages are routed to the user's Maildir folder structure using a .procmailrc in that user's home folder. -Dave

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dovecot ssl error message from my own connections
by Esteban L 01 Apr '19

01 Apr '19

Hello all, Just a minor thing. Not a big deal, because everything works fine, and I feel secure with my setup. But, I get this error message pretty much throughout the day/night, which appears to come from my own mail clients (desktop or mobile). I would like to resolve it, because it must me something (that is not good--that I may not understand), that may have other ramifications. So, here it is. date time myserver dovecot: imap-login: Debug: SSL error: SSL_read() syscall failed: Connection reset by peer Anyone have a suggestion of what this might hint to, other than obvious SSL. I tried parsing through various logs, but the most I find is just this single line. I can produce it, whenever I close my email client. Thanks in advance.

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Possible bug with last_login plugin and PostgreSQL
by Zhang Huangbin 01 Apr '19

01 Apr '19

Dear all, I'm trying to get last_login plugin working with PostgreSQL, but seems Dovecot doesn't handle duplicate key while updating last login time (note: same setting works fine with MariaDB). I wonder whether it's a bug of Dovecot or i should handle this with PostgreSQL trigger. OS: OpenBSD 6.4 (amd64) Dovecot: 2.2.36 PostgreSQL: 10.5 Error log: ################### Mar 31 11:15:21 ob dovecot: imap-login: Login: user=<postmaster(a)a.io>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=5936, TLS, session=<63/jV2CFhzt/AAAB> Mar 31 11:15:21 ob dovecot: imap(postmaster(a)a.io): Logged out in=300 out=1604 Mar 31 11:15:21 ob dovecot: imap-login: Login: user=<postmaster(a)a.io>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=29797, TLS, session=<lLboV2CFuZ9/AAAB> Mar 31 11:15:21 ob dovecot: dict(9584): Error: sql dict: commit failed: ERROR: duplicate key value violates unique constraint "last_login_pkey" Mar 31 11:15:21 ob dovecot: dict: Error: DETAIL: Key (username)=(postmaster(a)a.io) already exists. Mar 31 11:15:21 ob dovecot: imap(postmaster(a)a.io): Error: dict-client: server returned failure: 1554023721 (reply took 0.012 secs) Mar 31 11:15:21 ob dovecot: imap(postmaster(a)a.io): Error: last_login_dict: Failed to write value for user postmaster(a)a.io Mar 31 11:15:21 ob dovecot: imap(postmaster(a)a.io): Logged out in=70 out=732 ################## My Dovecot config: ################### protocol imap { mail_plugins = ... last_login ... } protocol pop3 { mail_plugins = ... last_login ... } plugin { last_login_dict = proxy::lastlogin #last_login_key = last-login/%u ... } dict { lastlogin = pgsql:/etc/dovecot/dovecot-last-login.conf ... } ################### SQL commands used to create PostgreSQL table: ########### CREATE TABLE last_login ( username VARCHAR(255) NOT NULL, last_login INT DEFAULT NULL, PRIMARY KEY (username) ); ########### File /etc/dovecot/dovecot-last-login.conf: ########### connect = host=127.0.0.1 port=5432 dbname=vmail user=vmailadmin password=<password> map { pattern = shared/last-login/$user table = last_login value_field = last_login value_type = uint fields { username = $user } } ##############

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I have a question.
by 김태용 01 Apr '19

01 Apr '19

Hi. I have a question. Can I limit the maximum number of messages I can sync per mailbox? Even if there are 10000 messages, I want to sync with the specified number of times. Ex)max sync mail count = 5000 (or 1000 or 2000..Outlook view message 5000) Thank you.

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