It is weird. At first, it seems that the logs are going fine. It goes like this for many minutes:

May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: Mailbox Archive: UID 25719: Looked up field hdr.IN-REPLY-TO from mail cache May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: Mailbox Archive: UID 25719: Looked up field hdr.MESSAGE-ID from mail cache May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: Mailbox Archive: UID 25719: Looked up field hdr.SUBJECT from mail cache May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: Mailbox Archive: UID 25719: Looked up field hdr.TO from mail cache May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: Mailbox Archive: UID 25719: Looked up field hdr.X-PRIORITY from mail cache May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: Mailbox Archive: UID 25719: Looked up field hdr.BCC from mail cache May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: Mailbox Archive: UID 25719: Looked up field hdr.REPLY-TO from mail cache May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: Mailbox Archive: UID 25719: Looked up field hdr.DISPOSITION-NOTIFICATION-TO from mail cache May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: Mailbox Archive: UID 25719: Looked up field hdr.LIST-POST from mail cache May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: multi-script: Start execute sequence May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: Executing script from /var/mail/vmail/mail/sieve/global/report-ham.svbin' May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: multi-script: Run script /var/mail/vmail/mail/sieve/global/report-ham.svbin' May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: Started running script /var/mail/vmail/mail/sieve/global/report-ham.svbin' May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: Finished running script ok' (status=/var/mail/vmail/mail/sieve/global/report-ham.svbin, resource usage: no usage recorded) May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: multi-script: Execute result May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Executing result (status=ok, commit=no) May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Starting execution of actions May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Executing actions May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Executing pipe action May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: action pipe: running program: sa-learn-ham.sh May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: program exec:/var/mail/vmail/mail/sieve/global/scripts/sa-learn-ham.sh: Created May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: program exec:/var/mail/vmail/mail/sieve/global/scripts/sa-learn-ham.sh: Pass environment: USER=francis@mydomain.com May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: program exec:/var/mail/vmail/mail/sieve/global/scripts/sa-learn-ham.sh: Pass environment: HOME=/var/mail/vmail/med-lo.eu/francis May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: program exec:/var/mail/vmail/mail/sieve/global/scripts/sa-learn-ham.sh: Pass environment: HOST=fb58607074fd May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: Mailbox Archive: UID 25719: Opened mail because: mail stream May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Finished executing pipe action (status=ok, keep=implicit) May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Finished executing actions (status=ok, keep=implicit) May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Finished executing result (no commit, status=ok, keep=yes) May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: multi-script: Sequence active May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: multi-script: Finishing sequence (status=ok) May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Executing result (status=ok, commit=yes) May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Starting execution of actions May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Executing actions May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Finished executing actions (status=ok, keep=implicit) May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Execute implicit keep (failure=no) May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Start storing into mailbox Archive May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Executing implicit keep action May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Execute storing into mailbox 'Archive' May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Updated existing mail in mailbox 'Archive' May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Finished executing implicit keep action (status=ok) May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Finalizing actions May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Finalize pipe action (status=ok, action_status=ok, commit_status=ok, pre-commit=yes) May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: sieve: uid=25719: Commit pipe action May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: program exec:/var/mail/vmail/mail/sieve/global/scripts/sa-learn-ham.sh: Establishing connection May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: program exec:/var/mail/vmail/mail/sieve/global/scripts/sa-learn-ham.sh: Forked child process May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: program exec:/var/mail/vmail/mail/sieve/global/scripts/sa-learn-ham.sh (416): Connected to program May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: program exec:/var/mail/vmail/mail/sieve/global/scripts/sa-learn-ham.sh (416): Finished streaming payload to program May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: program exec:/var/mail/vmail/mail/sieve/global/scripts/sa-learn-ham.sh (416): Finished input to program May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: program exec:/var/mail/vmail/mail/sieve/global/scripts/sa-learn-ham.sh (416): Disconnected May 01 14:20:04 imap(francis@mydomain.com)<226><zNW3d2MX9uku45qA>: Debug: program exec:/var/mail/vmail/mail/sieve/global/scripts/sa-learn-ham.sh (416): Waiting for program to finish after 6 msecs (timeout = 9994 msecs)

The client stays just like «Moving 1 of 4000 messages».

Then the logs start to go like this:

May 01 14:43:09 imap: Error: ERROR: the Bayes learn function returned an error, please re-run with -D for more information at /usr/bin/sa-learn line 500. May 01 14:43:12 imap: Error: ERROR: the Bayes learn function returned an error, please re-run with -D for more information at /usr/bin/sa-learn line 500. ^C root@fb58607074fd:/# tail -f /var/log/dovecot.log | grep Error May 01 14:43:15 imap: Error: plugin: eval failed: interrupted at /usr/bin/sa-learn line 513. May 01 14:43:15 imap: Error: ERROR: the Bayes learn function returned an error, please re-run with -D for more information at /usr/bin/sa-learn line 500. May 01 14:43:15 imap(francis@mydomain.com)<295><TwG1fGMXCuou45qA>: Error: sieve: failed to pipe message to program sa-learn-ham.sh': refer to server log for more information. [2024-05-01 14:43:15] May 01 14:43:15 imap(francis@mydomain.com)<295><TwG1fGMXCuou45qA>: Error: sieve: Execution of script /var/mail/vmail/mail/sieve/global/report-ham.sieve failed May 01 14:43:16 imap(francis@mydomain.com)<292><Ei2ofGMXBeou45qA>: Error: program exec:/var/mail/vmail/mail/sieve/global/scripts/sa-learn-ham.sh (2978): Forcibly terminated with signal 15 May 01 14:43:16 imap(francis@mydomain.com)<292><Ei2ofGMXBeou45qA>: Error: sieve: failed to pipe message to program sa-learn-ham.sh': refer to server log for more information. [2024-05-01 14:43:16] May 01 14:43:16 imap(francis@mydomain.com)<292><Ei2ofGMXBeou45qA>: Error: sieve: Execution of script /var/mail/vmail/mail/sieve/global/report-ham.sieve failed May 01 14:43:17 imap: Error: plugin: eval failed: interrupted at /usr/bin/sa-learn line 513. May 01 14:43:17 imap: Error: ERROR: the Bayes learn function returned an error, please re-run with -D for more information at /usr/bin/sa-learn line 500.

For many minutes, the mail client gets an error about reaching the max connections from ip, and the logs go on and on with the errors above.

What could be the issue?

Best, Francis

Francis Augusto Medeiros-Logeay Oslo, Norway