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One has to admire these spammers :(
I just now got a spam to <>. AFAIK, <> is legal only as a source
address, not a destination address, but I got it. (A quick check
shows that zmailer and qmail both say 250 on RCPT TO: <>, sendmail
says 550.)
So, I hacked my smtpcmds.c to outlaw it - a trivial change to
smtpcmds.c - and would like some advice. Would it be better to do
this in the router? And when I think that <> is illegal as
destination, am I forgetting my RFCs again? Matti, do you want the
patch?
(I wonder how long it'll take before someone traverses the entire DNS
and sends spam to all@<x> for -all- valid <x>.)
--Arnt