help with backscatter

Jorey Bump list at
Tue Dec 12 13:13:45 EST 2006

Chris Harms wrote:
> Hello,
> We are having some trouble with our servers sending out backscatter 
> spam.  I realize this is really a Sendmail issue, but if any list 
> readers have some insights on the best way to make Sendmail stop sending 
> bounces to outside domains, it would be greatly appreciated.

Take this to a sendmail newsgroup or mailing list and describe your 
configuration. Explain how/why your MTA accepts messages that it will 
bounce later. Be sure to mention if it is exposed directly to the 
internet, if it is behind another SMTP gateway, or if it acts as an SMTP 
gateway. You will be instructed not to accept messages for unknown users 
and not to accept messages that you intend to reject later. There are 
many helpful and experienced administrators on those lists that will 
help you with the configuration details, and you have a better chance of 
reaching someone with a similar environment.

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