OT: Stopping sendmail from allowing external hosts to use local email addresses

Gary Alexander gary at SAHARA.CO.ZA
Fri Aug 13 08:11:35 IST 2004

Hi All

As per my subject, can anyone point me to some documentation on how to
achieve this in sendmail ie: If a most likely virus infected host tries
to send a mail using someuser at mydomain.co.za to
someotheruser at mydomain.co.za and that host is not one of a set of
predefined hosts, is there a way to reject it?

This would really help to cut down the load of viruses I've seen lately
that are doing this, and I have no valid users that would require to do

Thanks for any help in this regard.

Gary Alexander
Technical Manager
Sahara Systems, South Africa
Tel: +27 (0)11 5421000
Fax: +27 (0)11 5421100


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