As you will see I'm a newbie in Postfix. I use it through Webmin.
One of my server's user got his email account info stolen, and I found almost 100 000 emails in Postfix queue sent from this email - or to this email.
After I removed everything I found a few items in the queue which had neither as sender or dest an email belonging to a domain managed by the server (lots of yandex.ru). How is it possible? What should I change to prevent this to happen again? (sending emails from domains not managed by the server).
Also, is there a parameter to limit the number of emails sent by an individual account?
UPDATE: Below is the config