[Tfug] odd sendmail lissening port

[Scott Corey]

Port 587 is reserved for e-mail message submission as defined in Internet 
Standards Track Document RFC 2476.

http://www.faqs.org/rfcs/rfc2476.html 

"3.1.  Submission Identification

   Port 587 is reserved for email message submission as specified in
   this document.  Messages received on this port are defined to be
   submissions.  The protocol used is ESMTP [SMTP-MTA, ESMTP], with
   additional restrictions as specified here.

   While most email clients and servers can be configured to use port
   587 instead of 25, there are cases where this is not possible or
   convenient.  A site MAY choose to use port 25 for message submission,
   by designating some hosts to be MSAs and others to be MTAs."

Scott

On Tuesday 02 July 2002 07:07 pm, Keith Davey wrote:
> Ok maybe its just casue I have not delt with sendmail for a bit, but this 
seems odd
> 
> sockstat -l  (Freebsd 4.6-p1)
> 
> root     sendmail    92    3 tcp4   *:25                  *:*
> root     sendmail    92    5 tcp4   *:587                 *:*
> 
> I understand port 25 as the standard smtp port, but what is 587 being used 
for?
> 
> Keith Davey
> 
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