Re: SMTP Security

  • From: Dar Scott <dsc@xxxxxxxx>
  • To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
  • Date: Wed, 9 Jan 2002 08:37:44 -0700

At 12:20 PM +0000 1/9/02, John Burridge wrote: 

I have heard that it is a security no-no to have your SMTP server reply with
the following when connecting to it through telnet.

"220 <hostname>.<domain>.com Microsoft ESMTP MAIL Service,
 Version: 5.0.2195.1600 ready at Thu, 30 Nov 2000 18:09:43 -0600"

Does anyone know how to disable this response?

I read recently that the RFC requires this and some SMTP servers won't talk to you without it. You might have to provide fake data instead of disabling 220.

Dar Scott





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