Is there any way to block incoming connections to SMTP based on (ideally
regexps for) the incoming connection's reverse DNS?

In other words drop all connections from hosts such as:
/client.*\.attbi\.com/

etc. ??

Thanks,

--
Joe Laffey              |  Want to convert subnet masks between different
LAFFEY Computer Imaging |  notations, or figure the number of IPs in a block?
St. Louis, MO           |  Whatmask-It's FREE - www.laffeycomputer.com/wm.html
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