Background:
We have a handful of hosts (running sendmail) acting as
the MXs for a few domains each.
Each domain is handled via
the sendmail/cf /etc/mail/virtusertable, with a set of known recipients and a catch-all reject rule.
Mail to postmaster on each host is aliased to root, and root is aliased to root+<host>@ourdomain.com.
The MX for ourdomain.com is Google Apps, and
[email protected] is a simple group that forwards to
the admins.
Google Apps will reject some emails at
the SMTP stage, usually because of illegal attachments (instead of accepting them and filing them as spam).
Problem:
Given a particular spam email sent to a domain in a virtusertable entry:
If
the recipient address rejects
the mail, then sendmail will try and send a DSN to
the sender.
If that sender also rejects
the mail (because it's a falsified sender, and
the MX for
the sender rejects
the mail as spam), then sendmail sends a DSN to
the postmaster.
The routing detailed above takes place, and...Google Apps rejects
the mail as well.
sendmail now gives up with a "savemail panic", and leaves
the mail in
the queue forever.
Our mail queue fills up with garbage
Is there any way I can get sendmail to discard messages that have been rejected by
the next virtusertable hop (i.e. after step 1 in
the Problem description)? Or does anyone have any other solutions to this?
