Command died with signal 6: "/usr/libexec/dovecot/deliver

Question

Emails are not being deliver to a particular email IDs.

We are using Sentora panel and Postfix mail server.

Error message:

Command died with signal 6: "/usr/libexec/dovecot/deliver"

Mail log:

Feb 14 09:50:27 host postfix/pipe[24913]: CBD7D2010A5: to=, relay=dovecot, delay=13047, delays=13045/0/0/1.3, dsn=4.3.0, status=SOFTBOUNCE (Command died with signal 6: "/usr/libexec/dovecot/deliver")

Please help.

Answer 1

Signal 6 is SIGABRT, which is typically sent when there is an internal problem with the code of Dovecot's deliver binary. There are a number of reasons this could happen.

You can turn on LDA logging within your Dovecot config to get more insight on what's actually happening:

protocol lda {
  ...
  # remember to give proper permissions for these files as well
  log_path = /var/log/dovecot-lda-errors.log
  info_log_path = /var/log/dovecot-lda.log
}

Answer 2

this can also happen when mail_temp_dir (default: /tmp) does not have enough space to extract attachments. it was fixed in https://github.com/dovecot/core/commit/43d7f354c44b358f45ddd10deb3742ec1cc94889 but is not yet available in some linux distributions (such as debian bullseye).