It happens when on the other side of wire there is an auto reply software which has not have proper prevention functionality. This will create servers message war, because mail servers will send infinite of emails.
Second case is when account receive a lots o spam, and many of this spam has bogus FROM address, so this account also receive many mailer-daemon responses while replying to that message.
MSH Postfix Autoresponder has built-in loop protection functionality.
It’s simple, if you do not want to have a protection then switch off Enable protection option (selected by default). Customization of auto reply density sending is also available - how many auto replies will be sent to the same recipient and in which time interval (ie. 15 minutes).
With this functionality you will not worry any more about loops.
To learn more visit MSH Postfix Autoresponder website.