After applying this fix: https://talk.plesk.com/threads/postfix-e-mails-of-some-domains-are-in-queue.333160/#post-798818
My e-mail users can't authenticate anymore..
dovecot_authdb_plesk[6834]: Failed to decrypt password for mail address
Same problem here with fresh install on Plesk 12.5
# ll /usr/bin/deliverquota
ls: cannot access /usr/bin/deliverquota: No such file or directory
No solution for this?