Hello List!

I'm running the whole courier suit, my users can use sqwebmail to setup filter recipes, and I got a very nasty mail loop when I configured a filter like this:

Mailbox A send a copy of each message to mailbox B, but B was invalid/unreachable (bad mx register), so each time A got a message, it was copied to B, but the copy failed and bounced back to A, and then maildrop copied the bounce to B and the bounce bounced and so on.... In a matter of minutes mailbox A got overquota and thousands of failed delivery messages were sent to postmaster after that... and the mail queue got full with thousands more!

I tried with an intentional loop (A copy to B and B copy to A) and it works the same! a total denial of service!

Is there a way to avoid this ? I'm really worried that my users begin to setup mail loops un/intentionally with sqwebmail!

This might not be a bug, but surely is a very nasty feature! Is there something that can be done?

Thanks for your help!