June 2017 - dovecot - dovecot.org

Why does Dovecot authentication against Openldap fail when using TLS encryption?
by Dimitri KOPRIWA 29 Jun '17

29 Jun '17

Dear Mailing list, I have a Dovecot v2.2.9 server that authenticate against a Openldap server. I want to configure Dovecot to use TLS for LDAP authentication. I have tried to fetch/send emails using Thunderbird: - IMAP succeed to fetch mail - SMTP failed to send mail The Dovecot server produce the following log : Jun 29 08:44:00 mail postfix/submission/smtpd[634]: connect from virtual.domain.com[172.16.0.1] Jun 29 08:44:01 mail dovecot: auth: Debug: auth client connected (pid=0) Jun 29 08:44:02 mail dovecot: auth: Debug: client in: AUTH#0111#011PLAIN#011service=smtp#011nologin#011lip=172.17.0.15#011rip=172.16.0.1#011secured#011resp=<hidden> Jun 29 08:44:02 mail dovecot: auth: Debug: ldap(me(a)domain.com,172.16.0.1): bind search: base=dc=mail,dc=domain,dc=com filter=(&(objectClass=CourierMailAccount)(mail=me(a)domain.com)) Jun 29 08:44:02 mail dovecot: auth: Debug: ldap(me(a)domain.com,172.16.0.1): no fields returned by the server Jun 29 08:44:02 mail dovecot: auth: Debug: ldap(me(a)domain.com,172.16.0.1): result: uid missing Jun 29 08:44:02 mail dovecot: auth: Debug: client passdb out: OK#0111#011user=me(a)domain.com Jun 29 08:44:04 mail postfix/submission/smtpd[661]: connect from mail.node.domain-ovh.consul[172.16.0.2] Jun 29 08:44:04 mail postfix/submission/smtpd[661]: lost connection after CONNECT from mail.node.domain-ovh.consul[172.16.0.2] Jun 29 08:44:04 mail postfix/submission/smtpd[661]: disconnect from mail.node.domain-ovh.consul[172.16.0.2] Jun 29 08:44:07 mail dovecot: auth: Debug: auth client connected (pid=662) Jun 29 08:44:07 mail dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=172.16.0.2, lip=172.17.0.15, TLS handshaking: Disconnected, session=<MGK6TRVTRACsEAAC> **Note that before I switch to use TLS**, the server was doing clear connection to Openldap and the **binding was working fine**. I have verified the ldap query using `ldapsearch` and it confirmed my binding must have worked: me@dev-01:[~]: ldapsearch -x -D "cn=readonly,dc=domain,dc=com" -W -H ldap://ldap.domain.com:389 -b "dc=mail,dc=domain,dc=com" -LLL "(&(objectClass=CourierMailAccount)(mail=me(a)domain.com))" -ZZ homeDirectory Enter LDAP Password: dn: mail=me(a)domain.com,dc=mailAccount,dc=domain.com ,dc=mail,dc=domain,dc=com homeDirectory: /var/mail I have the following `dovecot.cf`: login_greeting = server ready mail_uid = 5000 mail_gid = 5000 auth_mechanisms = plain login disable_plaintext_auth = yes ssl_ca = </etc/postfix/ssl/cacert.pem auth_debug_passwords = no auth_debug = yes auth_verbose = yes userdb { driver = ldap args = /etc/dovecot/conf.d/auth-ldap.conf.ext } passdb { driver = ldap args = /etc/dovecot/conf.d/auth-ldap.conf.ext } service imap-login { inet_listener imap { port = 0 } inet_listener imaps { port = 993 ssl = yes } } service pop3-login { inet_listener pop3 { port = 0 } inet_listener pop3s { port = 995 ssl = yes } } And this is the included `/etc/dovecot/conf.d/auth-ldap.conf.ext` file: # SSL/TLS uris = ldap://virtual.domain.com auth_bind = yes ldap_version = 3 dn = cn=readonly,dc=domain,dc=com dnpass = abc base = dc=mail,dc=domain,dc=com user_filter = (&(objectClass=CourierMailAccount)(mail=%u)) pass_filter = (&(objectClass=CourierMailAccount)(mail=%u)) user_attrs = uidNumber=5000,gidNumber=5000,homeDirectory=home,mailbox=mail=maildir:%$/Maildir:LAYOUT=fs default_pass_scheme = SSHA tls = yes tls_ca_cert_dir = /etc/postfix/ssl Why does Dovecot authentication against Openldap fail when I switch to TLS encryption? Hoping this mail will be read by somebody, Regards, Dimitri

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Re: localhost logins
by Joseph Tam 28 Jun '17

28 Jun '17

> Jun 27 12:03:27 bubba dovecot: auth: > ldap(SomeUser(a)MyDomain.com,127.0.0.1): invalid credentials > > The only other thing I can think of - Postfix runs on this server and > uses Dovecot SASL. Is it possible the Dovecot auth log line is caused > by a Postfix connection attempt? That would have been my first guess. Why don't you actually try it out (i.e. login in to SMTP with bad credentials) and see if the mysterious log entry appears. # Create bogus SMTP auth string AUTH=`echo "\0user\0badpassword\c" | openssl enc -base64` # SMTP session commands echo "EHLO test.client.helo\nAUTH PLAIN $PW\nQUIT" >data # Use whichever command your Postfix supports "250-AUTH PLAIN" # - if you greet pause, you'll have to enter data manually netcat -C mailserver 25 <data openssl s_client -crlf -quiet -starttls smtp -connect mailserver:25 <data openssl s_client -crlf -quiet -starttls smtp -connect mailserver:587 <data openssl s_client -crlf -quiet -connect mailserver:465 <data Joseph Tam <jtam.home(a)gmail.com>

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Re: localhost logins
by Daniel Miller 27 Jun '17

27 Jun '17

On 6/27/2017 1:33 AM, Daniel Miller wrote: > On 6/27/2017 12:42 AM, Fabian Schmidt wrote: >> >> Am 26.06.17 schrieb Daniel Miller: >> >>> On 2017-06-23 15:09, Marcus Rueckert wrote: >>>> On Fri, 23 Jun 2017 11:38:28 -0700 >>>> Daniel Miller <dmiller(a)amfes.com> wrote: >>>> >>>>> While auditing my logs after an account was compromised, I see a >>>>> number of entries like: >>>>> >>>>> Jun 23 11:32:18 bubba dovecot: auth: >>>>> ldap("one-of-my-accounts",127.0.0.1): invalid credentials >>>> >>>> webmail? >> >> Nagios or someone else monitoring dovecot? >> > Not running such - and they wouldn't be hitting multiple accounts. > Now I'm more confused. I changed Dovecot to listen only on a specific IP address - and I still see localhost log lines: Jun 27 12:03:27 bubba dovecot: auth: ldap(SomeUser(a)MyDomain.com,127.0.0.1): invalid credentials The only other thing I can think of - Postfix runs on this server and uses Dovecot SASL. Is it possible the Dovecot auth log line is caused by a Postfix connection attempt? Daniel

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localhost logins
by Daniel Miller 27 Jun '17

27 Jun '17

While auditing my logs after an account was compromised, I see a number of entries like: Jun 23 11:32:18 bubba dovecot: auth: ldap("one-of-my-accounts",127.0.0.1): invalid credentials I'm trying to figure out where this login attempt is coming from. I do run ASSP (an SMTP proxy) on this server, as well as Postfix - but I wouldn't think there'd be any communication with Dovecot for those? Postfix does use Dovecot SASL - but I see separate log entries for Postfix authentication failures. There are of course plenty of external IP's listed in Dovecot logs - I'm just asking for possible causes for the localhost entries. -- Daniel

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Released Pigeonhole v0.4.19 for Dovecot v2.2.31.
by Stephan Bosch 26 Jun '17

26 Jun '17

Hello Dovecot users, Here's the definitive 0.4.19 release. There is one additional fix. Changelog v0.4.19: * This release adjusts Pigeonhole to several changes in the Dovecot API, making it depend on Dovecot v2.2.31. Previous versions of Pigeonhole will produce compile warnings with the recent Dovecot releases (but still work ok). - Fixed bug in handling of implicit keep in some cases. Implicit side-effects, such as assigned flags, were not always applied correctly. This is in essence a very old bug, but it was exposed by recent changes. - include extension: Fixed segfault that (sometimes) occurred when the global script location was left unconfigured. The release is available as follows: https://pigeonhole.dovecot.org/releases/2.2/dovecot-2.2-pigeonhole-0.4.19.t… https://pigeonhole.dovecot.org/releases/2.2/dovecot-2.2-pigeonhole-0.4.19.t… Refer to http://pigeonhole.dovecot.org and the Dovecot v2.x wiki for more information. Have fun testing this release and don't hesitate to notify me when there are any problems. Regards, -- Stephan Bosch stephan(a)rename-it.nl

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v2.2.31 released
by Timo Sirainen 26 Jun '17

26 Jun '17

https://dovecot.org/releases/2.2/dovecot-2.2.31.tar.gz https://dovecot.org/releases/2.2/dovecot-2.2.31.tar.gz.sig This should be a great and stable release for the summer :) v2.2.32 is planned for the end of August. Hopefully soon afterwards we can get back to v2.3. * LMTP: Removed "(Dovecot)" from added Received headers. Some installations want to hide it, and there's not really any good reason for anyone to have it. + Add ssl_alt_cert and ssl_alt_key settings to add support for having both RSA and ECDSA certificates. + dsync/imapc, pop3-migration plugin: Strip trailing whitespace from headers when matching mails. This helps with migrations from Zimbra. + acl: Add acl_globals_only setting to disable looking up per-mailbox dovecot-acl files. + Parse invalid message addresses better. This mainly affects the generated IMAP ENVELOPE replies. - v2.2.30 wasn't fixing corrupted dovecot.index.cache files properly. It could have deleted wrong mail's cache or assert-crashed. - v2.2.30 mail-crypt-acl plugin was assert-crashing - v2.2.30 welcome plugin wasn't working - Various fixes to handling mailbox listing. Especially related to handling nonexistent autocreated/autosubscribed mailboxes and ACLs. - Global ACL file was parsed as if it was local ACL file. This caused some of the ACL rule interactions to not work exactly as intended. - auth: forward_* fields didn't work properly: Only the first forward field was working, and only if the first passdb lookup succeeded. - Using mail_sort_max_read_count sometimes caused "Broken sort-* indexes, resetting" errors. - Using mail_sort_max_read_count may have caused very high CPU usage. - Message address parsing could have crashed on invalid input. - imapc_features=fetch-headers wasn't always working correctly and caused the full header to be fetched. - imapc: Various bugfixes related to connection failure handling. - quota=imapc sent unnecessary FETCH RFC822.SIZE to server when expunging mails. - quota=count: quota_warning = -storage=.. was never executed - quota=count: Add support for "ns" parameter - dsync: Fix incremental syncing for mails that don't have Date or Message-ID headers. - imap: Fix hang when client sends pipelined SEARCH + EXPUNGE/CLOSE/LOGOUT. - oauth2: Token validation didn't accept empty server responses. - imap: NOTIFY command has been almost completely broken since the beginning. I guess nobody has been trying to use it.

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acl shared maildir with virtual users
by Rich Simcox 26 Jun '17

26 Jun '17

Can anyone point out where i'm going wrong with my dovecot sharedinbox setup with ACL i'm contemplating giving up with dovecot alltogether i've spent 3 days trying different paths to the virtual users mailboxes I seem to have two issues my acls are getting written to my sql db fine in roundcube i can see the shared folder but cant subscribe to it in thunderbird if i go to namespaces it sees the shared. namespace but its not listing anything in it even though my acls are written to the db please someone tell me what i'm missing i'm betting its something silly but i've been over and over the wiki here is my conf and below it an extract of my debug log # 2.2.28 (bed8434): /etc/dovecot/dovecot.conf # OS: Linux 2.6.32-642.3.1.el6.x86_64 x86_64 CentOS release 6.9 (Final) auth_cache_size = 1 M auth_debug = yes auth_debug_passwords = yes auth_mechanisms = plain login auth_policy_hash_mech = sha512 auth_policy_hash_nonce = 78204771 auth_policy_hash_truncate = 64 auth_policy_request_attributes = auth_database=mail database=mail service=dovecot username=%{orig_user} authtoken_hash=$0$0$%{hashed_password} local_host=%{real_lip} local_port=%{real_lport} remote_host=%{real_rip} remote_port=%{real_rport} auth_policy_server_api_header = X-API-Key:dovecot:xxxxxxxxxxxx auth_policy_server_timeout_msecs = 3000 auth_policy_server_url = http://127.0.0.1:579/dovecot-auth-policy auth_username_chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!#$-=?^_{}~./@+%" auth_verbose = yes dict { acl = sqlite:/usr/local/cpanel/etc/dovecot/dovecot-dict-shares.conf.ext expire = sqlite:/usr/local/cpanel/etc/dovecot/dovecot-dict-expire.conf.ext } disable_plaintext_auth = no first_valid_uid = 201 lda_mailbox_autocreate = yes lmtp_save_to_detail_mailbox = yes login_greeting = Welcome to Motorsport Tools mail_access_groups = dovecot mail_debug = yes mail_plugins = acl quota quota_clone fts fts_solr mail_prefetch_count = 20 mailbox_list_index = yes namespace inbox { inbox = yes location = mailbox Archive { auto = create special_use = \Archive } mailbox Archives { auto = no special_use = \Archive } mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Junk { auto = create special_use = \Junk } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { auto = no special_use = \Sent } mailbox Trash { auto = subscribe special_use = \Trash } mailbox spam { auto = create special_use = \Junk } prefix = INBOX. separator = . type = private } passdb { args = /usr/local/cpanel/etc/dovecot/cpauthd-dict.conf driver = dict result_failure = return-fail } passdb { args = /usr/local/cpanel/bin/dovecot-wrap driver = checkpassword skip = authenticated } plugin { acl = vfile:cache_secs=86400 acl_anyone = allow acl_shared_dict = proxy::acl expire_cache = yes fts = solr fts_solr = url=http://lTkFlGxjRar1hZAW:Ocj1FRRvlUs5Udj6@127.0.0.1:8984/solr/dovecot/ quota_exceeded_message = Mailbox is full please archive you old mail zlib_save = gz } protocols = lmtp imap service auth { unix_listener auth-client { mode = 0666 } } service config { vsz_limit = 2 G } service dict { unix_listener dict { group = dovecot mode = 0660 } } service imap-login { client_limit = 500 inet_listener imap { address = *,:: } inet_listener imaps { address = *,:: } process_limit = 100 process_min_avail = 8 service_count = 0 vsz_limit = 128 M } service imap { process_limit = 1024 vsz_limit = 512 M } service lmtp { client_limit = 1 process_limit = 500 unix_listener lmtp { group = mail mode = 0660 user = mailnull } vsz_limit = 512 M } service managesieve-login { client_limit = 500 process_limit = 100 process_min_avail = 8 service_count = 0 vsz_limit = 128 M } service managesieve { process_limit = 1024 vsz_limit = 512 M } service quota-status { executable = quota-status -p postfix unix_listener quota-status { mode = 0666 } } ssl = required ssl_cert = </etc/dovecot/ssl/dovecot.crt ssl_cipher_list = ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:-LOW:-SSLv2:-EXP ssl_key = # hidden, use -P to show it ssl_protocols = !SSLv2 !SSLv3 userdb { driver = prefetch } userdb { args = /usr/local/cpanel/etc/dovecot/cpauthd-dict.conf driver = dict } userdb { args = /usr/local/cpanel/bin/dovecot-wrap driver = checkpassword } protocol imap { imap_capability = +NAMESPACE imap_client_workarounds = tb-extra-mailbox-sep imap_idle_notify_interval = 24 mins imap_logout_format = in=%i, out=%o, bytes=%i/%o mail_location = maildir:~/ mail_max_userip_connections = 60 mail_plugins = acl quota imap_quota imap_acl imap_zlib quota_clone virtual fts fts_solr namespace { hidden = no list = yes location = maildir:%%h/Maildir:INDEXPVT=~/mail/virtual/%u/shared/%%u prefix = Shared.%%u. separator = . subscriptions = no type = shared } namespace sent { hidden = yes list = no location = virtual:/usr/local/cpanel/etc/dovecot/virtual/sent:INDEX=~/mail/virtual/%u prefix = sent separator = . } namespace spam { hidden = yes list = no location = virtual:/usr/local/cpanel/etc/dovecot/virtual/spam:INDEX=~/mail/virtual/%u prefix = spam separator = . } } protocol lda { mail_plugins = quota quota_clone postmaster_address = root quota_full_tempfail = no } local_name home.servers.co.uk www.home.servers.co.uk { ssl_cert = </etc/dovecot/ssl/dovecot.crt ssl_key = # hidden, use -P to show it } local_name website1.com www.website1.com www.website2.com website2.com { ssl_cert = </var/cpanel/ssl/domain_tls/website1.com/combined ssl_key = # hidden, use -P to show it i see this alot Debug: acl vfile: reading file /home/server/mail/website2.com/sales/.ebay.Sent/dovecot-acl this is how my path currently looks in debug but i've tried all sorts Jun 23 22:32:47 ssd99 dovecot: imap(sales(a)website2.com): Debug: Namespace : type=shared, prefix=Shared.%u., sep=., inbox=no, hidden=no, list=yes, subscriptions=no location=maildir:%h/Maildir:INDEXPVT=~/mail/virtual/sales@website2.com/shared/%u this is what my private namespace paths relate to Jun 23 22:32:47 ssd99 dovecot: imap(sales(a)website2.com): Debug: Namespace sent: type=private, prefix=sent, sep=., inbox=no, hidden=yes, list=no, subscriptions=yes location=virtual:/usr/local/cpanel/etc/dovecot/virtual/sent:INDEX=~/mail/virtual/sales@website2.com Jun 23 22:32:47 ssd99 dovecot: imap(sales(a)website2.com): Debug: fs: root=/usr/local/cpanel/etc/dovecot/virtual/sent, index=/home/server/mail/website2.com/sales/mail/virtual/sales@website2.com, indexpvt=, control=, inbox=, alt= please someone must know the answer

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ACL problems on shared folder
by Thomas Robers 26 Jun '17

26 Jun '17

Hello, I've a Dovecot Server Version 2.2.30.2 running on CentOS 6.9 and there's a problem with acls on shared folder. We have some mailboxes which are shared and used as a "group mailbox" and also some user who share their inbox and only the inbox when they are on holiday e.g.. When I set "acl_defaults_from_inbox = yes" it's not possible to restrict the access to only the inbox, meaning that the user who wants to share only their inbox have to share the whole mailbox. On the other hand when I set "acl_defaults_from_inbox = no" it is not possible to create a folder direct under the inbox of a "group mailbox" and one gets a "permission denied" message. Is this the normal behavior normal? Although the user who wants to create the folder has all rights he gets a "permission denied" message? Why? Am I missing something important? Does anyone who uses shared mailboxes had the same problem and solved this? Any suggestion or information, that I probably miss is welcome. If needed here's my Dovecot configuration: > # 2.2.30.2 (c0c463e): /etc/dovecot/dovecot.conf > # Pigeonhole version 0.4.18 (29cc74d) > # OS: Linux 2.6.32-696.3.1.el6.x86_64 x86_64 CentOS release 6.9 (Final) ext4 > auth_debug = yes > auth_master_user_separator = * > auth_mechanisms = plain login > auth_verbose = yes > disable_plaintext_auth = no > mail_debug = yes > mail_location = maildir:/export/home/imap/%Lu/Maildir > mail_plugins = acl zlib mail_log notify > mailbox_idle_check_interval = 10 secs > mailbox_list_index = yes > 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 > mbox_write_locks = fcntl > namespace { > hidden = no > ignore_on_failure = no > inbox = no > list = children > location = maildir:%%h/Maildir:INDEXPVT=%h/shared/%%u > prefix = shared/%%u/ > separator = / > subscriptions = yes > type = shared > } > namespace inbox { > hidden = no > inbox = yes > list = 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 = INBOX/ > separator = / > type = private > } > passdb { > args = /etc/dovecot/master-users > driver = passwd-file > master = yes > } > passdb { > args = /etc/dovecot/dovecot-ldap.conf.ext > driver = ldap > } > plugin { > acl = vfile:/etc/dovecot/global-acls:cache_secs=300 > acl_shared_dict = file:/export/home/shared-db/shared-mailboxes > mail_log_events = append delete undelete expunge copy mailbox_delete mailbox_rename flag_change > mail_log_fields = uid box msgid size from flags > sieve = ~/.dovecot.sieve > sieve_dir = ~/sieve > sieve_global = /var/lib/dovecot/sieve/global/ > sieve_user_log = ~/.dovecot.sieve.log > zlib_save = gz > zlib_save_level = 6 > } > protocols = imap pop3 lmtp sieve > service auth { > unix_listener /var/spool/postfix/private/auth { > mode = 0666 > } > unix_listener auth-userdb { > group = vmail > mode = 0660 > user = vmail > } > } > service imap-login { > process_limit = 500 > process_min_avail = 20 > } > service lmtp { > inet_listener lmtp { > address = 127.0.0.1 > port = 24 > } > } > service managesieve-login { > inet_listener sieve { > port = 4190 > } > inet_listener sieve_deprecated { > port = 2000 > } > } > ssl = required > ssl_cert = </etc/pki/dovecot/certs/mail.tutech.de.crt_chain > ssl_cipher_list = ALL:!LOW:!SSLv2:!EXP:!aNULL:!EXPORT > ssl_key = # hidden, use -P to show it > ssl_protocols = !SSLv3 !SSLv2 > syslog_facility = local6 > userdb { > args = /etc/dovecot/dovecot-ldap-userdb.conf.ext > driver = ldap > } > protocol lmtp { > mail_plugins = acl zlib mail_log notify sieve > } > protocol imap { > mail_max_userip_connections = 100 > mail_plugins = acl zlib mail_log notify imap_zlib imap_acl > } TIA & Regards, Thomas

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Courier migration to dovecot
by j.emerlik 23 Jun '17

23 Jun '17

Hi, I'm almost ready to migrate Courier to Dovecot 2.2.31 but I have one question about home and mail directory. It's good idea to have same directory form home and mail ? Which scenerio will be better and why ? For example: A) Home: /home/doamin/user1 Mail: /home/doamin/user1 B) Home: /home/doamin/user1/home Mail: /home/doamin/user1 C) Home: /home/doamin/user1/ Mail: /home/doamin/user1/mail Thanks & regards, Jack

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v2.2.31 release candidate released
by Timo Sirainen 23 Jun '17

23 Jun '17

https://dovecot.org/releases/2.2/rc/dovecot-2.2.31.rc1.tar.gz https://dovecot.org/releases/2.2/rc/dovecot-2.2.31.rc1.tar.gz.sig Unless new bugs are found, this will be the final v2.2.31 release, which will be released on Monday. * LMTP: Removed "(Dovecot)" from added Received headers. Some installations want to hide it, and there's not really any good reason for anyone to have it. + Add ssl_alt_cert and ssl_alt_key settings to add support for having both RSA and ECDSA certificates. + pop3-migration plugin: Strip trailing whitespace from headers when matching mails between IMAP and POP3. This helps with migrations from Zimbra. + acl: Add acl_globals_only setting to disable looking up per-mailbox dovecot-acl files. + Parse invalid message addresses better. This mainly affects the generated IMAP ENVELOPE replies. - v2.2.30 wasn't fixing corrupted dovecot.index.cache files properly. It could have deleted wrong mail's cache or assert-crashed. - v2.2.30 mail-crypt-acl plugin was assert-crashing - v2.2.30 welcome plugin wasn't working - Various fixes to handling mailbox listing. Especially related to handling nonexistent autocreated/autosubscribed mailboxes and ACLs. - Global ACL file was parsed as if it was local ACL file. This caused some of the ACL rule interactions to not work exactly as intended. - auth: forward_* fields didn't work properly: Only the first forward field was working, and only if the first passdb lookup succeeded. - Using mail_sort_max_read_count sometimes caused "Broken sort-* indexes, resetting" errors. - Using mail_sort_max_read_count may have caused very high CPU usage. - Message address parsing could have crashed on invalid input. - imapc_features=fetch-headers wasn't always working correctly and caused the full header to be fetched. - imapc: Various bugfixes related to connection failure handling. - quota=imapc sent unnecessary FETCH RFC822.SIZE to server when expunging mails. - quota=count: quota_warning = -storage=.. was never executed - quota=count: Add support for "ns" parameter - dsync: Fix incremental syncing for mails that don't have Date or Message-ID headers. - imap: Fix hang when client sends pipelined SEARCH + EXPUNGE/CLOSE/LOGOUT. - oauth2: Token validation didn't accept empty server responses. - imap: NOTIFY command has been almost completely broken since the beginning. I guess nobody has been trying to use it.

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