> >How does one go about blacklisting an entire network, say for example > >[EMAIL PROTECTED] does not seem to work?
If you have the option; block it from the firewall OR router. It saves SO much overhead!
Actualy, it is the lowest overhead to 5xx it at the MTA level.. if you block it at the firewall or router, it will keep trying repeatedly to connect to deliver the mail.. Admittedly it's not a lot of overhead, but one established connection with SMTP layer rejection is less traffic than 3 syn packets every hour for 5 days (which would be what a default sendmail box will do).
Although the difference between about 1kbyte (3 way handshake, HELO, MAIL FROM:, 550) and 14kbytes (360 40 byte syn packets) is kinda picking minor differences...
Sure the syn retries are spread out, but the total bandwidth consumed is greater.. if you were to be dealing with a whole lot of mail that you needed to kill, 550ing is definitely much lower overhead on your end.
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