[Mimedefang] Off Topic: Refuse Null Sender

[Jason Bertoch]

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Hi all, sorry to post off topic but searches for this only seem to return
reasons not to attempt.  However, I have a server that is exclusively used to
relay outbound mail.  I can't think of any legitimate reason for someone to
relay mail from the null sender.  Blocking this will seem to eliminate some
back-scatter as well as botnet spam.  I've tried various methods with the access
table to no avail.  Any ideas?


Jason A. Bertoch
Network Administrator
jason at electronet.net
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