nanog mailing list archives

Re: Computer systems blamed for feeble hurricane response?


From: Mike Tancsa <mike () sentex net>
Date: Wed, 14 Sep 2005 09:10:00 -0400


At 07:28 AM 14/09/2005, Suresh Ramasubramanian wrote:
On 9/14/05, Mike Tancsa <mike () sentex net> wrote:
> >Port 587?
> Not everyone implements that. You would make a large part of the
> internet unreachable via email
> vinyl# telnet mx2.mail.yahoo.com 587
> Trying 67.28.114.36...
> telnet: connect to address 67.28.114.36: Connection refused
> Trying 4.79.181.13...


Wrong host.  587 / msa is for outbound email

Sorry, my point was that you could not just assume the sending host was a mail server by connecting back to the host on the submission port as it might not be listening on that port or that because the host sending is not in the MX list, that its not a mail server.

---Mike

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