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North American Network Operators Group

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Re: fixing insecure email infrastructure (was: Re: [eweek article]Window of "anonymity" when domain exists, whois not updated yet)

  • From: Adi Linden
  • Date: Wed Jan 12 13:43:01 2005

> 0) for the love of God, Montresor, just block port 25 outbound already.

What is wrong with dedicating port 25 to server to server communication
with some means of authentication (DNS?) to ensure that it is indeed a
vaild mail server. Mail clients should be using port 587 to submit
messages to their local MTA.

Adi




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