Emails are not sent or received in Plesk while Amavis reports the error: Suicide in child_init_hook: BDB can't connect db env

Symptoms

• Amavis reports the following error message in /var/log/maillog:

  CONFIG_TEXT: Message: (!)_DIE: Suicide in child_init_hook: BDB can't connect db env. at /var/spool/amavisd/db: BDB0091 DB_VERSION_MISMATCH: Database environment version mismatch, Operation not permitted. at (eval 79) line 338.

• Emails may not be sent and or received.

Cause

Unclear.

Resolution

1. Connect to the server via SSH.

2. Restart the amavisd service:

   # service amavisd restart

3. Force deferred emails in the mail queue to be delivered:

   # postqueue -f

   # postsuper -r ALL