- dovecot - dovecot.org

IMAP flags and dovecot-keywords not working as expected
by Mark Foley 01 Aug '16

01 Aug '16

I've converted most of our users from Outlook to Thunderbird. One important feature of Thunderbird is that it pays attention to the IMAP non-standard message flags via the 'tags' feature (see http://wiki2.dovecot.org/MailboxFormat/Maildir) This is important because 2 users make extensive use of Outlook categories (Tags, in Thunderbird). I found that when I set a message to the 1st Tbird tag 0 (Important), the corresponding IMAP file got an 'a' suffix. Likewise, if I manually added an 'a' suffix to an IMAP file the corresponding tag was set displayed in Thunderbird. This made it easy for me to exports Outlook Categories and set IMAP messages flags accordingly. This worked perfectly on the user I was experimenting with (me). Recently, I converted one of these Outlook 'categories' users to Thunderbird. I added the appropriate flag letters to their IMAP messages, changed their tag names in Thunderbird, and created the following dovecot-keywords file as: 0 Board_and_Committee 1 Completed 2 Health_Care_meetings 3 Notifications 4 OSHP-DAS 5 personal_or_To_Do 6 Retirement_exits 7 $label5 8 Junk 9 $Forwarded 10 $MDNSent 11 $label2 However, none of the tags show up correctly in Thunderbird. If I manually set a message to have a tag of 0, the corresponding IMAP file gets a flag of 'm', not 'a' and the following is added to the dovecot-keywords files: 12 $label1 How can I fix this? Where is "$label1" text defined? Why did Thunderbird not snag the text for '0' from the dovecot-keywords file and give the IMAP file a tag of 'a'? My current theory is that the "Default" Thunderbird Tags corresponding to IMAP flags are not changeable and if new tags are create in Tbird, they get new flag letters. That would, of course, mean that if a user changes Thunderbird tag name, they would lose all tag settings on existing message. That doesn't seem right and I hope my theory is wrong. Any insight would be appreciated. --Mark

2 3

POP3 & IMAP inbox setting for virtual
by Michael Fox 01 Aug '16

01 Aug '16

Posted Monday 7/25. Haven't seen a response. Trying again: --- This is a noobie question, so bear with me if it's not worded correctly: Primary Requirements: 1) I'd like to have two namespaces - one private/per-user, and one public (visible by all logged-in users). The public mailbox(s) would be used to distribute information to all users. 2) I'd like both POP3 and IMAP users to see both namespaces. As I understand it, this requires the use of the virtual plugin for POP3, in order to create a virtual namespace which would mix together the private and public namespaces into one mailbox. I have read: http://wiki.dovecot.org/Plugins/Virtual https://sys4.de/de/blog/2013/02/11/dovecot-virtual-setup-mit-globaler-sieve- spamfilter-regel-fur-pop3-nutzer/ (via Google translation) The example uses a CASE statement in the MySQL userdb query. As I understand it, this is done to set which namespace contains the inbox: the private namespace or the virtual namespace -- depending on if the user is connected via the imap or pop3 service, respectively. Question: how do I accomplish the same goal (setting the proper namespace for the inbox) when using a passwd-file style flat file userdb? Thanks, Michael

2 4

self signed certs and dovecot imaps : howto? tlsv1 alert unknown ca
by hanasaki＠gmail.com 01 Aug '16

01 Aug '16

How do you setup dovecot to use a self signed cert? One server will be connected to the internet. One will be totally internal and have no runtime access to the internet. Getting the below error msg. Also, I think I have a TLS 1.0 and need a 1.2 cert?... Thank you. Jul 28 20:09:27 host dovecot: imap-login:: user=<>, rip=10...., lip=10...., TLS: SSL_read() failed: error:14094418:SSL routines:ssl3_read_bytes:tlsv1 alert unknown ca: SSL alert number 48, session=<kK2aELspLpkKAQF5>

2 1

any news Enterprise Repository Access?
by Götz Reinicke - IT Koordinator 31 Jul '16

31 Jul '16

Hi, we had access to the repository and it was working fine. But as we cant get the 2.2.25 update I was looking into the repofolders and there are RPMs "just" for RHEL 6// but not 5 any more. My be I missed the latest discussions or announcements? Could you give me an update on information and may be the RHEL 5 RPMs too? Thanks a lot and regards . Götz

6 8

dovecot runs on a pbl listed ip ?
by Benny Pedersen 31 Jul '16

31 Jul '16

X-Spam-Report: * 3.3 RCVD_IN_PBL RBL: Received via a relay in Spamhaus PBL * [52.178.156.48 listed in zen.spamhaus.org] * 3.6 FS_REPLICA Subject says "replica" * -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's * domain * 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily * valid * -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature * 0.8 RDNS_NONE Delivered to internal network by a host with no rDNS Received: from talvi.dovecot.org (unknown [52.178.156.48]) by wursti.dovecot.fi (Postfix) with ESMTP; Sun, 31 Jul 2016 04:27:22 +0200 (CEST) sorry if its not just me :( make sure all wan ips is in trusted-networks / internal-networks atleast in spamassassin who will make a bug for replica ? :=)

2 1

migration from cyrus; seg fault at mail_namespaces_get_root_sep
by vstargben＠gmail.com 31 Jul '16

31 Jul '16

Hi all, I am currently trying to migrate from cyrus to dovecot on a new system. Though only few accounts, I decided to use the mdbox format. To convert I use cyrus2dovecot first, then I use dsync to import the mailboxes. For compatibility I set the namespace of inbox to prefix = INBOX. and separator = . (as described here: http://wiki2.dovecot.org/Migration/Cyrus http://wiki.dovecot.org/Namespaces) This works except that the clients (mutt and Thunderbird) show an additional folder/mailbox "INBOX" below the inbox. How can I fix that? Should I add a prefix during conversion and not change the namespace config? On disk, the subfolders are next to INBOX. Well, I then tried to set list = children instead of "yes" for namespace inbox. On login a segfault occurs with this setting. See the information and backtrace below. Regards, Vincent ########################################################### linux-server2:~ # dovecot --version 2.2.25 (7be1766) linux-server2:~ # dovecot -n # 2.2.25 (7be1766): /etc/dovecot/dovecot.conf # Pigeonhole version 0.4.15 (97b3da0) # OS: Linux 4.1.21-14-default x86_64 openSUSE 42.1 (x86_64) btrfs base_dir = /data/mail/dovecot/ disable_plaintext_auth = no mail_debug = yes mail_gid = dovecot mail_location = mdbox:/data/mail/dovecot/maildat/%u mail_privileged_group = dovecot mail_uid = dovecot 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 namespace inbox { inbox = yes list = children location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = INBOX. separator = . } passdb { driver = pam } plugin { sieve = file:~/sieve;active=~/.dovecot.sieve } protocols = imap lmtp ssl = no ssl_dh_parameters_length = 2048 ssl_options = no_compression ssl_prefer_server_ciphers = yes userdb { driver = passwd } ################################################################ GNU gdb (GDB; openSUSE Leap 42.1) 7.9.1 Copyright (C) 2015 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-suse-linux". Type "show configuration" for configuration details. For bug reporting instructions, please see: <http://bugs.opensuse.org/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from /usr/lib/dovecot/imap...Reading symbols from /usr/lib/debug/usr/lib/dovecot/imap.debug...done. done. [New LWP 8366] Core was generated by `dovecot/imap'. Program terminated with signal SIGSEGV, Segmentation fault. #0 mail_namespaces_get_root_sep (namespaces=0x0) at mail-namespace.c:601 601 mail-namespace.c: Datei oder Verzeichnis nicht gefunden. Missing separate debuginfos, use: zypper install glibc-debuginfo-2.19-19.1.x86_64 (gdb) bt full #0 mail_namespaces_get_root_sep (namespaces=0x0) at mail-namespace.c:601 No locals. #1 0x0000559bfb1792a5 in cmd_list_ref_root (ref=0x559bfd155d78 "", client=0x559bfd155020) at cmd-list.c:324 ns = 0x0 ns_prefix = 0x559bfb1963ea "" ns_sep = <optimized out> str = <optimized out> #2 cmd_list_full (cmd=0x559bfd155c00, lsub=<optimized out>) at cmd-list.c:461 client = 0x559bfd155020 args = 0x559bfd1289b8 list_args = 0x7f02a7ab0093 <t_malloc0+35> arg_count = 21915 patterns = {arr = {buffer = 0x559bfd155d88, element_size = 8}, v = 0x559bfd155d88, v_modifiable = 0x559bfd155d88} ref = 0x559bfd155d78 "" pattern = 0x559bfd155d80 "" str = <optimized out> #3 0x0000559bfb1818ed in command_exec (cmd=cmd@entry=0x559bfd155c00) at imap-commands.c:180 hook = 0x559bfd125110 finished = <optimized out> cmd_start_timeval = {tv_sec = 1469732468, tv_usec = 662738} cmd_start_bytes_in = 29 cmd_start_bytes_out = 746 __FUNCTION__ = "command_exec" #4 0x0000559bfb17fe4f in client_command_input (cmd=cmd@entry=0x559bfd155c00) at imap-client.c:969 client = 0x559bfd155020 command = <optimized out> __FUNCTION__ = "client_command_input" #5 0x0000559bfb17fedf in client_command_input (cmd=0x559bfd155c00) at imap-client.c:1029 client = 0x559bfd155020 command = <optimized out> __FUNCTION__ = "client_command_input" #6 0x0000559bfb180285 in client_handle_next_command (remove_io_r=<synthetic pointer>, client=0x559bfd155020) at imap-client.c:1069 No locals. #7 client_handle_input (client=client@entry=0x559bfd155020) at imap-client.c:1081 _data_stack_cur_id = 3 remove_io = false handled_commands = true __FUNCTION__ = "client_handle_input" #8 0x0000559bfb180785 in client_input (client=0x559bfd155020) at imap-client.c:1128 cmd = 0x559bfd136130 output = 0x559bfd155a40 bytes = 36 ---Type <return> to continue, or q <return> to quit--- __FUNCTION__ = "client_input" #9 0x00007f02a7ac49dc in io_loop_call_io (io=0x559bfd155b10) at ioloop.c:564 ioloop = 0x559bfd124740 t_id = 2 __FUNCTION__ = "io_loop_call_io" #10 0x00007f02a7ac5ce7 in io_loop_handler_run_internal (ioloop=ioloop@entry=0x559bfd124740) at ioloop-epoll.c:220 ctx = 0x559bfd126260 list = 0x559bfd127c90 io = <optimized out> tv = {tv_sec = 1799, tv_usec = 999471} events_count = <optimized out> msecs = <optimized out> ret = 1 i = 0 call = <optimized out> __FUNCTION__ = "io_loop_handler_run_internal" #11 0x00007f02a7ac4a65 in io_loop_handler_run (ioloop=ioloop@entry=0x559bfd124740) at ioloop.c:612 No locals. #12 0x00007f02a7ac4c18 in io_loop_run (ioloop=0x559bfd124740) at ioloop.c:588 __FUNCTION__ = "io_loop_run" #13 0x00007f02a7a5a1e3 in master_service_run (service=0x559bfd1245e0, callback=<optimized out>) at master-service.c:640 No locals. #14 0x0000559bfb173eb2 in main (argc=1, argv=0x559bfd124390) at main.c:460 set_roots = {0x559bfb39c520 <imap_setting_parser_info>, 0x7f02a8274b20 <lda_setting_parser_info>, 0x0} login_set = {auth_socket_path = 0x559bfd11c050 "\210\300\021\375\233U", postlogin_socket_path = 0x0, postlogin_timeout_secs = 60, callback = 0x559bfb18cbd0 <login_client_connected>, failure_callback = 0x559bfb18c560 <login_client_failed>, request_auth_token = 1} service_flags = <optimized out> storage_service_flags = <optimized out> username = 0x0 auth_socket_path = 0x559bfb19530e "auth-master" c = <optimized out> (gdb)

1 0

Occasional lock timeouts on Linode VM with Dovecot Replication
by Reuben Farrelly 31 Jul '16

31 Jul '16

I've been seeing periodic entries in my dovecot logs like this: dovecot[3464]: dsync-server(kaylene): Error: Couldn't lock /home/kaylene/.dovecot-sync.lock: Timed out after 30 seconds: 3 Time(s) dovecot[3464]: dsync-server(reuben): Error: Couldn't lock /home/reuben/.dovecot-sync.lock: Timed out after 30 seconds: 1 Time(s) They occur several times per day, but don't appear to have any obvious cause and I am not aware of any problems this is causing. [They could be the cause of some reappearing UID type messages that also periodically are logged, but I can't be sure] They occur on a lightly loaded Linode VM, KVM Paravirtualised and with only local SSD disk storage. The VM is a Gentoo Linux VM running the latest kernels that Linode provide. I also saw this problem under Xen. The dovecot setup is a dsync replication between two hosts, there is about 150ms of latency between them. The host where I am seeing these messages on (lightning) is a dovecot replica of another system (thunderstorm). I am using Maildir storage. Thunderstorm sees the vast majority of the client side reads and writes and lightning just functions as a not-so-active replica. Thunderstorm is also a VM but on VMware (also on SSDs). This system has never had this problem. I've had this across many dovecot versions going back many months now so it's impossible to pinpoint when this started. I am currently running dovecot -git master-2.2 branch at the moment. I've never seen disk latency in excess of 30s on any system either so I doubt that raw IO is the cause. I don't have any settings specified in 10-mail.conf in the Mail processes section relating to locking or mmap. Has anyone else experienced this and/or any ideas about where to look next to determine the root cause? Is this a common warning to see in cloud hosted/shared environments? Reuben

2 2

Master-Master replication question
by Remko Lodder 29 Jul '16

29 Jul '16

Dear list, I have setup a master-master replication setup. My primairy MX's send email over on a DNS loadbalanced way, so DNS is doing some kind of round-robin way of sending mail to both master servers. I found out, that on one of the two machines, the email synchronisation is heavily delayed. Lets assume server A receives a mail from the MX; it synchronises almost instantly with the other server. Whenever server B receives the email, it could take up to several hours to synchronise the email, it seems that it is not detected prior. It is also interesting to see, that the mailboxes on server A (Where users login to retrieve their email via webmail/clients) are significantly smaller then the mailboxes on server B. When investigating, it seems that "older" mailboxes (or storage rather since we use mdbox) are still there on server B, which already had been removed on server A. My personal mailbox was 170MB on server A, while it was still 2.5GB on server B. (which was around that size before cleaning up the mailsboxes). I enabled debugging on the servers, and I see rather quick : "Replication requests" on server A, but when getting an email on server B, I do not see the request at all. My servers are both running the same version, same configuration (utilizing puppet), both running on ZFS and FreeBSD. Where server B is more loaded in it's memory because of some bhyve VM's and the server A does not run any VM. Does someone have any pointers on where to look? Thanks in advance ;-) Remko Included below the configurations from server A and B: Server A: # 2.2.25 (7be1766): /usr/local/etc/dovecot/dovecot.conf # Pigeonhole version 0.4.14 (099a97c) # OS: FreeBSD 10.3-RELEASE-p2 amd64 auth_mechanisms = plain login disable_plaintext_auth = no doveadm_password = # hidden, use -P to show it haproxy_trusted_networks = YYYY lda_mailbox_autocreate = yes lda_mailbox_autosubscribe = yes lmtp_save_to_detail_mailbox = yes mail_debug = yes mail_fsync = always mail_location = mdbox:~/mdbox mail_plugins = " quota notify replication" 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 namespace { inbox = yes location = mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Spam { auto = subscribe special_use = \Junk } mailbox Trash { auto = subscribe special_use = \Trash } prefix = separator = . } passdb { driver = pam } plugin { antispam_backend = mailtrain antispam_mail_notspam = --ham antispam_mail_sendmail = /usr/local/bin/sa-learn.sh antispam_mail_spam = --spam antispam_spam_pattern_ignorecase = spam;junk antispam_trash_pattern_ignorecase = trash;deleted items;deleted messages antispam_verbose_debug = 1 mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename mail_log_fields = uid box msgid size mail_replica = tcps:the other server:12346 sieve = ~/.dovecot.sieve sieve_dir = ~/sieve sieve_global_dir = /usr/local/etc/dovecot/sieve/global/ sieve_global_path = /usr/local/etc/dovecot/sieve/default.sieve } postmaster_address = postmaster@xxx protocols = imap pop3 lmtp sieve replication_dsync_parameters = -d -N -l 60 -U replication_max_conns = 100 service aggregator { fifo_listener replication-notify-fifo { mode = 0666 } unix_listener replication-notify { mode = 0666 } } service auth { unix_listener /var/spool/postfix/private/auth { mode = 0666 } } service doveadm { inet_listener { port = 12346 ssl = yes } } service imap-login { inet_listener imap_haproxy { haproxy = yes port = 10143 } inet_listener imaps_haproxy { haproxy = yes port = 10144 ssl = yes } service_count = 1 } service imap { process_limit = 1024 } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } } service pop3 { process_limit = 1024 } service replicator { process_min_avail = 1 unix_listener replicator-doveadm { mode = 0666 } } ssl_ca = </usr/local/etc/letsencrypt/live/XXX ssl_cert = </usr/local/etc/letsencrypt/live/XXX ssl_client_ca_file = /usr/local/certificates/letsencrypt-ca.pem ssl_key = </usr/local/etc/letsencrypt/live/XXX ssl_protocols = !SSLv2 !SSLv3 userdb { driver = passwd } verbose_proctitle = yes protocol lmtp { auth_username_format = %n mail_plugins = quota sieve postmaster_address = postmaster@xxxx } protocol lda { mail_plugins = " quota notify replication sieve" } protocol imap { mail_max_userip_connections = 50 mail_plugins = " quota notify replication imap_quota antispam" } Server B: # 2.2.25 (7be1766): /usr/local/etc/dovecot/dovecot.conf # Pigeonhole version 0.4.14 (099a97c) # OS: FreeBSD 10.3-RELEASE amd64 auth_mechanisms = plain login disable_plaintext_auth = no doveadm_password = # hidden, use -P to show it haproxy_trusted_networks = YYYY lda_mailbox_autocreate = yes lda_mailbox_autosubscribe = yes lmtp_save_to_detail_mailbox = yes mail_debug = yes mail_fsync = always mail_location = mdbox:~/mdbox mail_plugins = " quota notify replication" 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 namespace { inbox = yes location = mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Spam { auto = subscribe special_use = \Junk } mailbox Trash { auto = subscribe special_use = \Trash } prefix = separator = . } passdb { driver = pam } plugin { antispam_backend = mailtrain antispam_mail_notspam = --ham antispam_mail_sendmail = /usr/local/bin/sa-learn.sh antispam_mail_spam = --spam antispam_spam_pattern_ignorecase = spam;junk antispam_trash_pattern_ignorecase = trash;deleted items;deleted messages antispam_verbose_debug = 1 mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename mail_log_fields = uid box msgid size mail_replica = tcps:the other host:12346 sieve = ~/.dovecot.sieve sieve_dir = ~/sieve sieve_global_dir = /usr/local/etc/dovecot/sieve/global/ sieve_global_path = /usr/local/etc/dovecot/sieve/default.sieve } postmaster_address = postmaster@xxx protocols = imap pop3 lmtp sieve replication_dsync_parameters = -d -N -l 60 -U replication_max_conns = 100 service aggregator { fifo_listener replication-notify-fifo { mode = 0666 } unix_listener replication-notify { mode = 0666 } } service auth { unix_listener /var/spool/postfix/private/auth { mode = 0666 } } service doveadm { inet_listener { port = 12346 ssl = yes } } service imap-login { inet_listener imap_haproxy { haproxy = yes port = 10143 } inet_listener imaps_haproxy { haproxy = yes port = 10144 ssl = yes } service_count = 1 } service imap { process_limit = 1024 } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } } service pop3 { process_limit = 1024 } service replicator { process_min_avail = 1 unix_listener replicator-doveadm { mode = 0666 } } ssl_ca = </usr/local/etc/letsencrypt/live/xxx ssl_cert = </usr/local/etc/letsencrypt/live/xxx ssl_client_ca_file = /usr/local/certificates/letsencrypt-ca.pem ssl_key = </usr/local/etc/letsencrypt/live/xxx ssl_protocols = !SSLv2 !SSLv3 userdb { driver = passwd } verbose_proctitle = yes protocol lmtp { auth_username_format = %n mail_plugins = quota sieve postmaster_address = postmaster@XXXXX } protocol lda { mail_plugins = " quota notify replication sieve" } protocol imap { mail_max_userip_connections = 50 mail_plugins = " quota notify replication imap_quota antispam" }

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Re: Client app says my chained Comodo cert is invalid
by Joseph Tam 28 Jul '16

28 Jul '16

> The trouble appears when I attempt to configure a client account in > Mail.app on my Mac. For the POP server name, I enter my VPS? > ?45.56.81.181", because public DNS is still pointing to my existing > host. I set the account to use the Apple TLS certificate, and then > click to save this new account info. Before saving, Mail.app checks my > entries by attempting to log in. The result is: ?The identify of > server 45.56.81.181 cannot be verified. The certificate for this > server is invalid.? Well, yes, that's what you would expect. You've told your mail client to connect to "45.56.81.181", the client starts the SSL negotiation and finds the certificate is made out for "sheepsystems.com", and your mail client complains about the mismatch (a possible MITM attack). This is what you want SSL enabled system to do. Since 45.56.81.181 does not map to "sheepsystems.com" yet, you can short-circuit DNS and add a direct mapping to your Mac by adding this to /etc/hosts: 45.56.81.181 sheepsystems.com then reconfiguring your mail client to use the server "sheepsystems.com". This will appease the SSL constraint. > appear in /var/log/mail.log [2]. Don't know what this is about -- probably your Mac bailing out on authentication. Joseph Tam <jtam.home(a)gmail.com>

3 2

Client app says my chained Comodo cert is invalid
by Jerry Krinock 28 Jul '16

28 Jul '16

I’ve configured Dovecot and Postfix on a new VPS running Ubuntu 16.04, using Linode’s tutorial [1], to require authentication and SSL encryption for both POP3 and SMTP. All looks OK to me except, when my email client app (macOS Mail.app) tries to log in, it says that my cert is invalid. The trouble appears when I attempt to configure a client account in Mail.app on my Mac. For the POP server name, I enter my VPS’ “45.56.81.181", because public DNS is still pointing to my existing host. I set the account to use the Apple TLS certificate, and then click to save this new account info. Before saving, Mail.app checks my entries by attempting to log in. The result is: “The identify of server 45.56.81.181 cannot be verified. The certificate for this server is invalid.” At the same time, on my new server, some entries appear in /var/log/mail.log [2]. The certificate in question is a new PositiveSSL/Comodo cert I bought the other day. It works OK for serving web pages - I mean, on this same Mac, when I visit my under-construction site at https://45.56.81.181 in Safari or Firefox, I get the padlock icon and no warnings. Comodo gave me two two files, a “.crt” which contains my cert, and a “.ca-bundle.crt” which contains their certs. Per Dovecot documentation, I concatenated these into a “chained” file containing all 3 certs, starting with mine. In /etc/dovecot/conf.d/10-ssl.conf, I set ssl_cert = this “chained” file. I tried adding the two original cert files to macOS Keychain.app with “Always trust” but that did not help. Being new at this, I would appreciate any suggestions. My `dovecot -n` output is below [3]. Thank you very much! Jerry Krinock [1] https://www.linode.com/docs/email/postfix/email-with-postfix-dovecot-and-my… ************************************************** [2] /var/log/mail.log entries when client attempts login Jul 27 12:22:19 bird dovecot: pop3-login: Debug: SSL: where=0x10, ret=1: before/accept initialization [24.4.251.228] Jul 27 12:22:19 bird dovecot: pop3-login: Debug: SSL: where=0x2001, ret=1: before/accept initialization [24.4.251.228] Jul 27 12:22:19 bird dovecot: pop3-login: Debug: SSL: where=0x2001, ret=1: unknown state [24.4.251.228] Jul 27 12:22:19 bird dovecot: message repeated 6 times: [ pop3-login: Debug: SSL: where=0x2001, ret=1: unknown state [24.4.251.228]] Jul 27 12:22:19 bird dovecot: pop3-login: Debug: SSL: where=0x2002, ret=-1: unknown state [24.4.251.228] Jul 27 12:22:19 bird dovecot: pop3-login: Debug: SSL: where=0x2002, ret=-1: unknown state [24.4.251.228] Jul 27 12:22:19 bird dovecot: pop3-login: Warning: SSL failed: where=0x2002: unknown state [24.4.251.228] Jul 27 12:22:19 bird dovecot: pop3-login: Debug: SSL error: Disconnected Jul 27 12:22:19 bird dovecot: pop3-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=24.4.251.228, lip=45.56.81.181, TLS handshaking: Disconnected, session=<8HuX76I4p8gYBPvk> Yes, 24.4.251.228 is the IP address of my Mac. ************************************************** [3] Output from `dovecot -n` # 2.2.22 (fe789d2): /etc/dovecot/dovecot.conf # Pigeonhole version 0.4.13 (7b14904) # OS: Linux 4.5.5-x86_64-linode69 x86_64 Ubuntu 16.04 LTS ext4 auth_mechanisms = plain login mail_location = maildir:/var/mail/vhosts/%d/%n mail_privileged_group = mail namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = } passdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } protocols = imap pop3 lmtp service auth-worker { user = vmail } service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0666 user = postfix } unix_listener auth-userdb { mode = 0600 user = vmail } user = dovecot } service imap-login { inet_listener imap { port = 0 } inet_listener imaps { port = 993 ssl = yes } } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } } service pop3-login { inet_listener pop3 { port = 0 } inet_listener pop3s { port = 995 } } ssl = required ssl_cert = </etc/ssl/localcerts/sheepsystems_com_chained.crt ssl_key = </etc/ssl/localcerts/linode.sheepsystems.com.key userdb { args = uid=vmail gid=vmail home=/var/mail/vhosts/%d/%n driver = static } verbose_ssl = yes

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