North American Network Operators Group
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Re: SPAM from own customers

  • From: Suresh Ramasubramanian
  • Date: Tue Dec 02 14:26:11 2003 
Michel Renfer  writes on 12/2/2003 12:50 PM:


How will you deal with the problem, that one user can flood your
SMTP Server with tousends of emails within 10-20 minutes?
Virus filtering

Rate limit (+ script to auto terminate user) and smtp auth on outbounds

Separate inbound and outbound smtp relay. Don't let your inbound MX relay for your dialup pool (some trojans take the rDNS name / hostname of the infected box and do nslookup -q=mx domainname)

Ask AOL for an [email protected] feed - a lot of these trojan spams seem to target AOL users.

etc

--
srs (postmaster|suresh)@outblaze.com // gpg : EDEDEFB9
manager, outblaze.com security and antispam operations