Hi all! After deleting a queue in Postfix called 'postfix-smtp-relayout1' from postmulti (by running -p stop; -e disable; -e destroy) and recreating it as 'postfix-relayout1', I am seeing the below message once a minute in /var/log/maillog: Oct 1 12:13:54 server postmulti: fatal: No matching instances The output of postmulti contains only the queues I expect to see and looks as follows: Code: - - y /etc/postfix postfix-relayout1 mta y /etc/postfix-relayout1 postfix-relayout2 mta y /etc/postfix-relayout2 Only these queues are referred to in the Postfix configuration, and the old one isn't configured anywhere in /etc or /var/spool: Code: [[email protected][email protected][email protected] I ran a locate on the queue name and found a master.lock for the rogue instance in /var/lib/postfix-smtp-relayout1, which I removed; however, the error is still ongoing. I have restarted Postfix including by removing master locks to see if that stops the error, but to no avail. The internet doesn't seem to contain much information on the error. It is usually triggered when running a postmulti command such as 'postmulti -i postfix-smtp-relayout1 -p stop' on a queue that doesn't exist, so it appears that Postfix is still queriyng the queue for some reason. Any ideas most appreciated!