June 2026 - dovecot - dovecot.org

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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dsync does not like sieve
by Stéphane Veyret 14 Jul '26

14 Jul '26

Hi, I’m using Dovecot for many years. My installation is configured to manage spam using sieve. In the same time, I have a backup server, connecting to the main server every night in order to backup emails (note that the main server is not pushing its data, but the backup server is pulling them). Dovecot v2.4 made me re-write the configuration files, so maybe I missed something, but since then, I cannot make both these service work in the same time. With my current configuration, the backup server is terminating in error with the following logs: dsync-remote(example(a)example.com)<HbkSGoKQG2o8+gEAGKlOPA>: Error: brain S: Exporting mailbox INBOX failed: Mailbox attribute iteration failed: Internal error occurred. Refer to server log for more information. [2026-05-31 03:36:03] (and there are no more logs anywhere). Because this message <https://dovecot.org/mailman3/archives/list/dovecot@dovecot.org/thread/MGCGR…> was suggesting there could be a problem with sieve, I tried to modify the configuration. And indeed, when changing sieve configuration, the backup is working again. But then, my spam filter isn’t anymore. Here are the relevant parts of the configuration for managing sieve. Can someone help me saying what could be wrong? protocols { sieve = yes imap = yes lmtp = yes } sieve_extensions { fileinto = yes reject = yes envelope = yes encoded-character = yes vacation = yes subaddress = yes comparator-i;ascii-numeric = yes relational = yes regex = yes imap4flags = yes copy = yes include = yes body = yes variables = yes enotify = yes environment = yes mailbox = yes date = yes index = yes ihave = yes duplicate = yes mime = yes foreverypart = yes extracttext = yes vnd.dovecot.pipe = yes vnd.dovecot.environment = yes } sieve_pipe_bin_dir = /etc/dovecot/sieve sieve_pipe_socket_dir = sieve-pipe sieve_plugins { sieve_imapsieve = yes sieve_extprograms = yes } service managesieve-login { inet_listener sieve { port = 4190 } } sieve_script personal { } sieve_script default { path = /etc/dovecot/sieve/spam.sieve } protocol imap { mail_plugins { acl = yes quota = yes imap_acl = yes imap_quota = yes imap_sieve = yes } } protocol lmtp { mail_plugins { acl = yes quota = yes sieve = yes } } namespace user { inbox = yes prefix = separator = / type = private mailbox * { sieve_script reportspam { cause = flag path = /etc/dovecot/sieve/report-spam.sieve type = before } } } Thank you. Stéphane -- Bien cordialement, / Plej kore, Stéphane Veyret Hi, I'm using Dovecot for many years. My installation is configured to manage spam using sieve. In the same time, I have a backup server, connecting to the main server every night in order to backup emails (note that the main server is not pushing its data, but the backup server is pulling them). Dovecot v2.4 made me re-write the configuration files, so maybe I missed something, but since then, I cannot make both these service work in the same time. With my current configuration, the backup server is terminating in error with the following logs: dsync-remote([1]example(a)example.com)<HbkSGoKQG2o8+gEAGKlOPA>: Error: brain S: Exporting mailbox INBOX failed: Mailbox attribute iteration failed: Internal error occurred. Refer to server log for more information. [2026-05-31 03:36:03] (and there are no more logs anywhere). Because [2]this message was suggesting there could be a problem with sieve, I tried to modify the configuration. And indeed, when changing sieve configuration, the backup is working again. But then, my spam filter isn't anymore. Here are the relevant parts of the configuration for managing sieve. Can someone help me saying what could be wrong? protocols { sieve = yes imap = yes lmtp = yes } sieve_extensions { fileinto = yes reject = yes envelope = yes encoded-character = yes vacation = yes subaddress = yes comparator-i;ascii-numeric = yes relational = yes regex = yes imap4flags = yes copy = yes include = yes body = yes variables = yes enotify = yes environment = yes mailbox = yes date = yes index = yes ihave = yes duplicate = yes mime = yes foreverypart = yes extracttext = yes vnd.dovecot.pipe = yes vnd.dovecot.environment = yes } sieve_pipe_bin_dir = /etc/dovecot/sieve sieve_pipe_socket_dir = sieve-pipe sieve_plugins { sieve_imapsieve = yes sieve_extprograms = yes } service managesieve-login { inet_listener sieve { port = 4190 } } sieve_script personal { } sieve_script default { path = /etc/dovecot/sieve/spam.sieve } protocol imap { mail_plugins { acl = yes quota = yes imap_acl = yes imap_quota = yes imap_sieve = yes } } protocol lmtp { mail_plugins { acl = yes quota = yes sieve = yes } } namespace user { inbox = yes prefix = separator = / type = private mailbox * { sieve_script reportspam { cause = flag path = /etc/dovecot/sieve/report-spam.sieve type = before } } } Thank you. Stephane -- Bien cordialement, / Plej kore, Stephane Veyret References Visible links 1. mailto:example@example.com 2. https://dovecot.org/mailman3/archives/list/dovecot@dovecot.org/thread/MGCGR…

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imap-sieve, question concerning "sieve_user_email" and variables, migration from 2.3 to 2.4
by Claus-Justus Heine 14 Jul '26

14 Jul '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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crash in sieve-filter with 2.4.4
by Noah Meyerhans 13 Jul '26

13 Jul '26

Forwarded from https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1139275 A certain poison pill message seems to crash sieve-filter. A reproducer script, email message, and sieve script are at https://salsa.debian.org/noahm/dovecot/-/tree/sieve-crash/debian/tests/siev… The problem is not reproducible with 2.4.1, so it seems to be a regression introduced since then. Coredump details follow: root@dovecot-test:/home/noahm/dovecot# coredumpctl info | cat PID: 110911 (sieve-filter) TID: 110911 (sieve-filter) UID: 65534 (nobody) GID: 65534 (nogroup) Signal: 6 (ABRT) Timestamp: Mon 2026-06-08 19:16:37 UTC (29s ago) Command Line: sieve-filter -u dep8 -e -W -D -C -v /srv/dovecot-dep8/test.sieve INBOX Executable: /usr/bin/sieve-filter Control Group: /user.slice/user-1000.slice/session-5.scope Unit: session-5.scope Slice: user-1000.slice Session: 5 Owner UID: 1000 (noahm) Boot ID: 46469969e01043559d913ef8ab625856 Machine ID: a497a098bd094c1c8f7c8ed02aa21853 Hostname: dovecot-test Storage: /var/lib/systemd/coredump/core.sieve-filter.65534.46469969e01043559d913ef8ab625856.110911.1780946197000000.zst (present) Size on Disk: 253.5K Message: Process 110911 (sieve-filter) of user 65534 dumped core. Module libgcc_s.so.1 from deb gcc-16-16.1.0-1.amd64 Module libstdc++.so.6 from deb gcc-16-16.1.0-1.amd64 Stack trace of thread 110911: #0 0x00007fe06b09fcfc n/a (libc.so.6 + 0x97cfc) #1 0x00007fe06b048d02 raise (libc.so.6 + 0x40d02) #2 0x00007fe06b0304b2 abort (libc.so.6 + 0x284b2) #3 0x00007fe06b26ed45 n/a (libdovecot.so.0 + 0x6ed45) #4 0x00007fe06b357597 default_fatal_handler (libdovecot.so.0 + 0x157597) #5 0x00007fe06b26ec72 i_panic (libdovecot.so.0 + 0x6ec72) #6 0x00007fe06b273b90 n/a (libdovecot.so.0 + 0x73b90) #7 0x00007fe06b3498fb n/a (libdovecot.so.0 + 0x1498fb) #8 0x00007fe06b34a784 n/a (libdovecot.so.0 + 0x14a784) #9 0x00007fe06b34a93b buffer_append (libdovecot.so.0 + 0x14a93b) #10 0x00007fe06b344cc6 dregex_code_match_groups (libdovecot.so.0 + 0x144cc6) #11 0x00007fe06b806a27 n/a (libdovecot-sieve.so.0 + 0x6da27) #12 0x00007fe06b806cd0 n/a (libdovecot-sieve.so.0 + 0x6dcd0) #13 0x00007fe06b7ee411 sieve_match_value (libdovecot-sieve.so.0 + 0x55411) #14 0x00007fe06b7ee711 sieve_match (libdovecot-sieve.so.0 + 0x55711) #15 0x00007fe06b7f5862 n/a (libdovecot-sieve.so.0 + 0x5c862) #16 0x00007fe06b7eccde sieve_interpreter_continue (libdovecot-sieve.so.0 + 0x53cde) #17 0x00007fe06b7fbfbe sieve_execute (libdovecot-sieve.so.0 + 0x62fbe) #18 0x00005638c0022fcf main (sieve-filter + 0x3fcf) #19 0x00007fe06b031f77 n/a (libc.so.6 + 0x29f77) #20 0x00007fe06b032027 __libc_start_main (libc.so.6 + 0x2a027) #21 0x00005638c0023791 _start (sieve-filter + 0x4791) ELF object binary architecture: AMD x86-64

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