Cable internet

[David Cuthbert]

Bill Hacker wrote:
Caveat: Use some other mx for your e-mail, not comcast.

Our MX'en blacklist all of comcast, as they do nothing useful to block 
outbound to port 25, and are *infested* with Win-Zombies.
I'm puzzled.  Why block the Comcast SMTP server instead of just the 
Comcast dynamic IP block?  The zombies are highly unlikely to try to use 
the official SMTP server (which WILL throttle you if it detects spamming).