On Tue, 12 Jun 2001, Michael L. Wyland wrote:

> To all:
>
> I know that LISTSERV's "FILTER_ALSO" function allows blocking of spammers'
> e-mail addresses, including wildcard support.  However, I can't find a way
> to block spammers using IP addresses for their open relays, etc.
>
> Am I missing something?  The SPAM-L list spends much of its time
> identifying IP addresses to block, which seems to be the appropriate
> course, given the widespread spoofing of e-mail addresses by spammers.

If you run the latest sendmail, you can do what you want at that level.