Multiple copies of the same message

[Stephen Lee]

I have Mailscanner 2.53/Sophos running on RH7.1/Sendmail 8.11.6 quite
nicely. The only piece of instruction I did not follow was to change DM from
sendmail.cf to the full name of my mailserver. If I did that, wouldn't I
lose the ability to masquerade the server? However, the problem I am having
now is that every so often, some of my users get multiple copies of the same
message over a period of several hours and even 1 day later. This never
happened before the AV scanner was installed. I would appreciate suggestions
on how to resolve this problem.

Thanks,
Stephen