North American Network Operators Group

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Re: Time to check the rate limits on your mail servers

  • From: Raymond Dijkxhoorn
  • Date: Thu Feb 03 10:07:17 2005


One additional thing that I think wasnt mentioned in the article -
Make sure your MXs (inbound servers) are separate from your outbound
machines, and that the MX servers dont relay email for your dynamic IP
netblock. Some other trojans do stuff like getting the ppp domain name

That, on the other hand, gets you into trouble with rather stupid Spam
filters, that only accept mails from a server, if that server is also
MX for the senders domain.

Yes, this is stupid, but that does not change the fact, that these
setups are out there.
Start using authenticated SMTP for this.