Any way to get a copy of the logs? You could blackhole the other server's IP address for 4 days until that auto-retry (default) expires and that should stop the ping-pong effect.
A client seems to have a situation whereby a forged, and invalid, address in their domain was used to send out spam. Some of the recipient addresses are also bogus and therefore cause a mail delivery failure. This bounces back to the invalid user on their mail server and causes another mail delivery failure back to the original recipient's system. I'm getting the impression from my client's description that this bouncing back and forth is not stopping at this point but rather is continuing.
So first let me ask, does sendmail actually work this way, with no limit on ping-pong bounces? If it does then there must certainly be a way to stop it, such as silently dropping failed mail. I'm going to guess that a tweak to sendmail.cf will do the trick and am off to research that. I figured I'd check with the group as well just in case I can learn even more about the situation, which is usually the case with this bunch!
Thanks!
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