3.1 after update - dovecot will stop sending mails and clog mailq

System: Debian Jessie

After update to 3.1 and reconfiguring services, the /etc/dovecot.conf has no - or lose if set previously - entry for postmaster_adress in the lda section. Dovecot stops sending emails with the following error:

Error reading configuration: Invalid settings: postmaster_address setting not given lda: Fatal: Internal error occurred.

Fix: Manual editing of /etc/dovecot.conf:

protocol lda {
  mail_plugins = sieve quota
  postmaster_address = postmaster@localhost
}

Add postmaster_address = postmaster@localhost line.

Restart Service and force postfix to resend the mailq: protocol lda { mail_plugins = sieve quota postmaster_address = postmaster@ws2.rootfuchs.de }

root@# service dovecot reload
root@# postqueue -f

Will fix the problem and resume normal operations.

The update Script should consider this changes.