June 2026 - dovecot - dovecot.org

deliver fails because of a permission issue with SSL private key file
by Markus Schönhaber 22 Oct '26

22 Oct '26

Hi, I'm trying to make Postfix hand incoming mail to Dovecot by using Dovecot's deliver. But this fails with a permission error: > Feb 17 15:50:12 debian13-cont postfix/pipe[13133]: 171C17206: to=<recipient(a)dest.examle.org>, relay=dovecot, delay=0.17, delays=0.1/0/0/0.07, dsn=5.3.0, status=bounced (Command died with status 89: "/usr/lib/dovecot/deliver". Command output: doveconf: Fatal: Error in configuration file /etc/dovecot/certs.conf line 3: key_file: open(/etc/ssl/private/ssl-cert-snakeoil.key) failed: Permission denied ) How can I solve this (short of making the private key file world readable, of course)? Regards mks I have this in Postfix' master.cf: > dovecot unix - n n - - pipe > flags=DROhu user=vmail:vmail argv=/usr/lib/dovecot/deliver -e -f ${sender} -a ${recipient} -d ${user}@${domain} # LANG=C id vmail uid=501(vmail) gid=501(vmail) groups=501(vmail),104(ssl-cert) # LANG=C ls -l /etc/ssl/private/ total 4 -rw-r----- 1 root ssl-cert 1704 Feb 4 17:15 ssl-cert-snakeoil.key # doveconf -n # 2.4.2-2+debian13 (0962ed2104): /etc/dovecot/dovecot.conf # Pigeonhole version 2.4.2-2+debian13 (767418c3) # OS: Linux 6.19.0-2-MANJARO x86_64 Debian 13.3 btrfs # Hostname: debian13-cont dovecot_config_version = 2.4.2 dovecot_storage_version = 2.4.2 log_debug = category=sql mail_driver = sdbox mail_gid = vmail mail_home = /var/spool/vmail/home/%{user | domain}/%{user | username} mail_path = /var/spool/vmail/mail/%{user | domain}/%{user | username} mail_plugins { quota = yes } mail_uid = vmail protocols = imap lmtp sieve sql_driver = mysql mysql localhost { dbname = postfixadmin password = # hidden, use -P to show it user = postfixadmin } passdb sql { query = SELECT 'vmail' AS userdb_uid, 'vmail' AS userdb_gid, CONCAT('/var/spool/vmail/home/', maildir) AS userdb_home, CONCAT(quota, 'B') AS userdb_quota_storage_size, username AS user, password FROM mailbox WHERE username = '%{user}' AND active = '1'; } userdb prefetch { } userdb sql { iterate_query = SELECT username AS user FROM mailbox WHERE active = '1'; query = SELECT 'vmail' AS uid, 'vmail' AS gid, CONCAT('/var/spool/vmail/home/', maildir) AS home, CONCAT(quota, 'B') AS quota_storage_size, username AS user, password FROM mailbox WHERE username = '%{user}' AND active = '1'; } namespace inbox { inbox = yes separator = / mailbox Drafts { special_use = "\\Drafts" } mailbox Entwürfe { special_use = "\\Drafts" } mailbox Junk { special_use = "\\Junk" } mailbox Trash { special_use = "\\Trash" } mailbox "Gelöschte Objekte" { special_use = "\\Trash" } mailbox Sent { special_use = "\\Sent" } mailbox "Gesendete Objekte" { special_use = "\\Sent" } } service auth { inet_listener tcp_auth { port = 12345 } unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0666 user = postfix } } service auth-worker { } ssl_server { cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem key_file = /etc/ssl/private/ssl-cert-snakeoil.key } protocol imap { mail_plugins { imap_quota = yes } } quota "User quota" { } dict_server { dict mysql { driver = sql sql_driver = mysql dict_map priv/quota/messages { sql_table = quota username_field = username dict_map_value_field messages { } } dict_map priv/quota/storage { sql_table = quota username_field = username dict_map_value_field bytes { } } } } quota_clone { dict proxy { name = mysql } }

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imap-sieve, question concerning "sieve_user_email" and variables, migration from 2.3 to 2.4
by Claus-Justus Heine 19 Oct '26

19 Oct '26

Hi there, I have a question concerning the configuration setting sieve_user_email In a v2.3 setup I had it set to sieve_user_email = %Ln(a)some.concrete.domain Now I am trying to migrate to v2.4 and thought the direct translation from the old variable expansion scheme to the new scheme deployed in v2.4 would be sieve_user_email = %{user|username|lower}(a)some.concrete.domain However, this does not work. Testing the documentation yields the following error: # dovecot -n -c dovecot.conf > /dev/null doveconf: Error: sieve: sieve settings: Failed to parse configuration: Failed to expand sieve_user_email setting variables: Unknown variable 'user' doveconf: Fatal: Error in configuration file dovecot.conf: Failed to initialize Sieve Setting "sieve_user_email" to something without variable expansion or just commenting it out yields a configuration which is accepted by "dovecot -n". Now I wonder: a) v2.3 did not complain. But perhaps just because it was using "%Ln" literally? b) In case it did work in v2.3, should it work in v2.4 also? And if so: what would be the correct syntax / variable names? c) Under which circumstances is this setting "sieve_user_email" used? The documentation states: https://doc.dovecot.org/main/core/summaries/settings.html#sieve_user_email > The primary e-mail address for the user. > > This is used as a default when no other appropriate address is available for sending messages. > > If this setting is not configured, either the postmaster or null <> address is used as a sender, depending on the action involved. > > This setting is important when there is no message envelope to extract addresses from, such as when the script is executed in IMAP. I thought that then it would make sense to use something which depends on the login-name of the IMAP-user? Or was this "sieve_user_email" intended to hold just one static email like "my_global_catch_all(a)some.concrete.domain"? Kind thanks for clarification, best regards Claus -- Claus-Justus Heine himself(a)claus-justus-heine.de http://www.claus-justus-heine.de/ Schatzmeister der Camerata Academica Freiburg e.V. --- www.cafev.de

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Variable expansion syntax: Filter "default" throws error (unwanted)
by Johannes Nohl 20 Sep '26

20 Sep '26

I am using dovecot 2.4.2 (almost) with new config language and I have a working configuration. However, the check for disabled users throws permanently errors in the log file, whenever a user is missing the ldap attribute for disabled. This is - in my view - due to a misfunction of Filter "default". passdb ldap { driver = ldap ldap_bind = yes ldap_filter = (&(|(objectClass=posixAccount)(objectClass=mailAccount))(uid=%{user})) fields { user = %{ldap:uid} nologin = %{ldap:shadowInactive | default(null)} reason = The account for this email address is disabled. } } This results in the following log line: 2026-03-31T00:46:31.102690+02:00 mailserver dovecot: auth(test,ipv4,sasl:plain)<YE81n0VOVuofEeSD>: Error: ldap: auth_passdb_post settings: Failed to parse configuration: Failed to expand passdb_fields/nologin setting variables: ldap: No such attribute 'shadowinactive' The right behaviour would be no logging on login success. Because the Filter "default" is intended to suppress any errors ("When value is missing or empty, you can use the default filter to provide value. Missing variables will cause errors and must be negated with default. This does not apply to all providers, some providers return empty when value is missing."). https://doc.dovecot.org/2.4.2/core/settings/variables.html#variable-expansi… As you may have seen I had to borrow null-value from sql db config also to make nologin ignoring a non present attribute. This is undocumented obviously. Instead, a non-working tip is provided ("Changed: 2.4.0 Extra fields can now also be set to empty string, "). However, the following does not work: "nologin = {ldap:shadowinactive | default("")}". https://doc.dovecot.org/2.4.2/core/settings/variables.html Also, the documentation is missing/hiding the part which explains that "default()" can be used to avoid error logs. PR regarding the documentation source is sent already. See "Fails if the attribute is not present, unless the ` <missing part>" https://doc.dovecot.org/2.4.0/core/config/auth/databases/ldap.html#ldap-spe… Is there another way to verify if account is disabled? -- Johannes Nohl postmaster i-t-cloud -- Johannes Nohl postmaster(a)i-t-cloud.de I am using dovecot 2.4.2 (almost) with new config language and I have a working configuration. However, the check for disabled users throws permanently errors in the log file, whenever a user is missing the ldap attribute for disabled. This is - in my view - due to a misfunction of Filter "default". passdb ldap { driver = ldap ldap_bind = yes ldap_filter = (&(|(objectClass=posixAccount)(objectClass=mailAccount))(uid=%{user})) fields { user = %{ldap:uid} nologin = %{ldap:shadowInactive | default(null)} reason = The account for this email address is disabled. } } This results in the following log line: *2026-03-31T00:46:31.102690+02:00 mailserver dovecot: auth(test,ipv4,sasl:plain)<YE81n0VOVuofEeSD>: Error: ldap: auth_passdb_post settings: Failed to parse configuration: Failed to expand passdb_fields/nologin setting variables: ldap: No such attribute 'shadowinactive' The right behaviour would be no logging on login success. Because the Filter "default" is intended to suppress any errors ("When value is missing or empty, you can use the default filter to provide value. Missing variables will cause errors and must be negated with default. This does not apply to all providers, some providers return empty when value is missing."). https://doc.dovecot.org/2.4.2/core/settings/variables.html#variable-expansi… As you may have seen I had to borrow null-value from sql db config also to make nologin ignoring a non present attribute. This is undocumented obviously. Instead, a non-working tip is provided ("Changed: 2.4.0 Extra fields can now also be set to empty string, "). However, the following does not work: "nologin = {ldap:shadowinactive | default("")}". https://doc.dovecot.org/2.4.2/core/settings/variables.html Also, the documentation is missing/hiding the part which explains that "default()" can be used to avoid error logs. PR regarding the documentation source is sent already. See "Fails if the attribute is not present, unless the ` <missing part>" https://doc.dovecot.org/2.4.0/core/config/auth/databases/ldap.html#ldap-spe… Is there another way to verify if account is disabled? -- Johannes Nohl postmaster i-t-cloud -- Johannes Nohl postmaster(a)i-t-cloud.de

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Problem email client iPhone ios18.2
by andrzej.milewski＠gmail.com 08 Sep '26

08 Sep '26

Hello, I have a fairly new installation of the Dovecot server version 2.3.19.1 on Debian 12.8. In general, the server works correctly. It sends and receives emails without issues. The clients primarily use Thunderbird on desktops and Gmail on Android. However, some clients are using iPhones with various hardware versions. Those with iOS below version 18 work correctly without any issues. Those who have updated their phones to version 18 and now even 18.2 are experiencing problems with mailbox synchronization. On version 18.2, the issue appears as follows: When you open the app, you can read several messages. They load correctly, but, for instance, attachments do not. If I wait for some time, the attachment eventually loads. During this time, I observe the server logs, and it shows that a certain session on the Dovecot server has ended. Dec 17 13:13:01 iredmail0 dovecot[408]: imap(xxx(a)xxx.com)<44785><1QGZCHcp/+3AqM2O>: Disconnected: Connection closed (UID SEARCH finished 92.295 secs ago) in=2972 out=6076956 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=36 body_bytes=6059064 Dec 18 08:40:41 iredmail0 dovecot[408]: imap(xxx(a)xxx.com)<177412>: Disconnected: Connection closed (UID FETCH finished 90.079 secs ago) in=5126 out=1304237 deleted=0 expunged=0 trashed=0 hdr_count=94 hdr_bytes=289688 body_count=89 body_bytes=969615 Dec 18 08:42:19 iredmail0 dovecot[408]: imap(xxx(a)xxx.com)<177410><D5mqU4cpZ+nAqM2O>: Disconnected: Connection closed (UID FETCH finished 95.051 secs ago) in=4475 out=1162785 deleted=0 expunged=0 trashed=0 hdr_count=95 hdr_bytes=281674 body_count=61 body_bytes=839545 Dec 18 08:44:17 iredmail0 dovecot[408]: imap(edyta.kowalewska(a)laktopol.com.pl)<177918>: Disconnected: Connection closed (UID FETCH finished 92.132 secs ago) in=29399 out=30266644 deleted=0 expunged=0 trashed=0 hdr_count=565 hdr_bytes=1726228 body_count=628 body_bytes=28109455 After the session is closed, the attachment loads immediately. From the logs and router analysis, it appears that the download happens in another previously opened session. After this incident, I go to another message with an attachment, and the situation repeats. There are also situations where the email body does not load, and the app waits for the server until the session closes and the content is fetched in another session. It does not matter whether I connect to the server via the internet or through a local network. On an iPhone 7 with iOS 15.8.3, everything works smoothly. Attachments open without issues. On iOS 18.1.1, attachments do not load, and the session does not close on its own. It takes forever unless the app is closed. In the Gmail app, everything works correctly without any issues. This is clearly a problem with the mail client on iPhone. However, is there anything I can adjust in my server settings to mitigate this issue for users? My dovecot configuration https://pastebin.com/UPNQ5dZz

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History Assignment Writing Help – Expert Assistance
by Theo Wilson 05 Sep '26

05 Sep '26

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Pay Someone to Take My Online Course?
by xotawa2329＠hapincy.com 05 Sep '26

05 Sep '26

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Lazy-Expunge plugin documentation incomplete?
by Randolf Richardson 04 Sep '26

04 Sep '26

One of the Dovecot repository maintainers on GitHub recommended sending an eMail to you regarding the issue I encountered: Documentation for lazy-expunge doesn't work https://github.com/dovecot/documentation/issues/1555 -------- I converted from Dovecot 2.3 to Dovecot 2.4.1, which was not a minor upgrade. Anyway, I can't get the lazy-expunge plugin to work in 2.4.1 now. Here's my configuration file from 2.3 -- how can I get this working in 2.4.1? Thanks. namespace inbox { mailbox EXPUNGED { autoexpunge = 32days autoexpunge_max_mails = 100000 #auto = create } } # Namespace for lazy_expunge plugin namespace { prefix = EXPUNGED/ hidden = yes list = no subscriptions = no separator = / location = maildir:~/Maildir.deleted:INDEX= } mail_plugins = $mail_plugins lazy_expunge acl plugin { # Move expunged messages into the .EXPUNGED namespace lazy_expunge = EXPUNGED/ # Only move to expunged storage if this is the last copy of the message in the user´s account lazy_expunge_only_last_instance = yes # Exclude Drafts from lazy expunging lazy_expunge_exclude = \Drafts # Copy of each message is done with hard links whenever possible maildir_copy_with_hardlinks = yes # Define ACL so that user cannot list the .EXPUNGED mailbox # Example entry: .EXPUNGED owner rwstipekxa acl = vfile:/etc/dovecot/dovecot.acl # dovecot.acl contains one line: EXPUNGED owner ip # Expunged messages most likely don't want to be included in quota: quota_rule = EXPUNGED:ignore } #lazy_expunge_mailbox = EXPUNGED Here's an example of someone else who encountered the same problem: https://www.dovecot.org/mailman3/archives/list/dovecot@dovecot.org/thr ead/25BXSHQWGQQ3ACVZSYF3O3LC4WROTUCI/ Randolf Richardson, CNA - randolf(a)inter-corporate.com Inter-Corporate Computer & Network Services, Inc. Beautiful British Columbia, Canada https://www.inter-corporate.com/

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NFC normalization rename errors after 2.3 to 2.4 upgrade (mdbox)
by Jan Münnich 29 Aug '26

29 Aug '26

Hi, We just upgraded from 2.3 to 2.4.3 and are now getting errors like this for any mailbox with German umlauts in the name: "Error: Failed to rename mailbox 'Anträge' for NFC normalization: Mailbox doesn't exist: Anträge" The mailboxes work fine otherwise, doveadm mailbox status shows them with correct message counts. The errors show up on IMAP access but don't seem to break anything. We're using mdbox. On disk the directory is stored as mUTF-7: Antr&AOQ-ge doveadm mailbox list gives back the name with c3 a4 for the ä, which is already NFC. We double-checked with python3 unicodedata and it confirms the name is NFC. So it seems like dovecot is trying to rename something that doesn't need renaming, and then failing. Is there a way to turn off this automatic rename? Or is this a known issue with mdbox and mUTF-7 directory names? Any help would be appreciated to find out if this is a bug or a configuration issue on our side! Thanks, Jan

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[BUG] IMAP hibernation fails on FreeBSD 15.x with "Invalid peer_dev_major value"
by Jordan Ostrev 20 Aug '26

20 Aug '26

Hi, IMAP hibernation compiles and attempts to run on FreeBSD 15.x (tested with Dovecot 2.4.4 and FreeBSD 15.1), but fails at runtime with: plain imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 24 21:27:08 classic dovecot[36888]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 24 21:27:08 classic dovecot[36888]: imap(jordan(a)ostreff.info)<37120><ExaV/gNVAdt/AAAB>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Root cause: In src/imap/imap-client-hibernate.c, the code serializes peer_dev_major and peer_dev_minor using major() and minor() macros: c str_printfa(cmd, "\tpeer_dev_major=%lu\tpeer_dev_minor=%lu\tpeer_ino=%llu", (unsigned long)major(peer_st.st_dev), (unsigned long)minor(peer_st.st_dev), (unsigned long long)peer_st.st_ino); On FreeBSD, major() and minor() can return UINT64_MAX (18446744073709551615) for file descriptors that are not block/character devices (such as sockets on tmpfs/devfs). This value exceeds UINT_MAX and cannot be parsed by str_to_uint() in imap-master-client.c. Historical context: This was discussed on the Dovecot mailing list in July 2019 (thread: "Hibernation errors") but apparently never resolved upstream. The same failure mode persists in Dovecot 2.4.4. Impact: IMAP hibernation is effectively non-functional on FreeBSD 15.x Processes remain running indefinitely instead of being hibernated Documentation note: The Dovecot 2.4 documentation states that hibernation "is not supported on kqueue based systems currently, such as FreeBSD." However, the code still compiles and attempts to run, producing these errors rather than being disabled at compile time or gracefully skipped at runtime. Would it make sense to either: Disable hibernation at compile time for kqueue systems, or Add validation for major()/minor() return values before serialization? Thanks, Jordan Hi, IMAP hibernation compiles and attempts to run on FreeBSD 15.x (tested with Dovecot 2.4.4 and FreeBSD 15.1), but fails at runtime with: plain imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 24 21:27:08 classic dovecot[36888]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 24 21:27:08 classic dovecot[36888]: imap(jordan(a)ostreff.info)<37120><ExaV/gNVAdt/AAAB>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Root cause: In src/imap/imap-client-hibernate.c, the code serializes peer_dev_major and peer_dev_minor using major() and minor() macros: c str_printfa(cmd, "\tpeer_dev_major=%lu\tpeer_dev_minor=%lu\tpeer_ino=%llu", (unsigned long)major(peer_st.st_dev), (unsigned long)minor(peer_st.st_dev), (unsigned long long)peer_st.st_ino); On FreeBSD, major() and minor() can return UINT64_MAX (18446744073709551615) for file descriptors that are not block/character devices (such as sockets on tmpfs/devfs). This value exceeds UINT_MAX and cannot be parsed by str_to_uint() in imap-master-client.c. Historical context: This was discussed on the Dovecot mailing list in July 2019 (thread: "Hibernation errors") but apparently never resolved upstream. The same failure mode persists in Dovecot 2.4.4. Impact: o IMAP hibernation is effectively non-functional on FreeBSD 15.x o Processes remain running indefinitely instead of being hibernated Documentation note: The Dovecot 2.4 documentation states that hibernation "is not supported on kqueue based systems currently, such as FreeBSD." However, the code still compiles and attempts to run, producing these errors rather than being disabled at compile time or gracefully skipped at runtime. Would it make sense to either: 1. Disable hibernation at compile time for kqueue systems, or 2. Add validation for major()/minor() return values before serialization? Thanks, Jordan

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Sieve vnd.dovecot.config extension does not work when mail is delivered to lmtp inet_listener but works when delivered to lmtp unix_listener
by DK 20 Jul '26

20 Jul '26

Hello. I have a strange problem with sieve scripts vnd.dovecot.config extension processing on newest dovecot 2.3 and 2.4. When I deliver mail via lmtp unix_listener sieve script can get sieve_env_* variable with no problem. However when I deliver mail via lmtp inet_listener sieve script can not get the same sieve_env_* variable. I deliver mails from postfix to lmtp inet_listener directly (not via haproxy). The same postfix is used when testing lmtp unix_listener mail delivery which works. Any clues what could be the cause of such problem? DK

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