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Re: SMTP server resides on non standard port. How can I send mailto it?

1998-11-13 13:43:47

Actually, you can specify the target port in the SRV resource record
(RFC 2052), which is currently Experimental and more or less ignored
by everyone.  However, there is a move afoot to put it on standards
track (draft-ietf-dnsind-rfc2052bis-00.txt).  If that happens and it
gets widely deployed, then in a few years it might solve your problem.


From:  John C Klensin <klensin(_at_)mci(_dot_)net>
Date:  Thu, 12 Nov 1998 23:32:00 -0500 (Eastern Standard Time)
In-reply-to:  <364B6FED(_dot_)C1922BEC(_at_)taxxi(_dot_)com>
To:  Alexey Melnikov <mel(_at_)taxxi(_dot_)com>
Cc:  ietf-smtp(_at_)imc(_dot_)org
Message-id:  <SIMEON(_dot_)9811122300(_dot_)O(_at_)p6(_dot_)mci(_dot_)net>
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Sender:  owner-ietf-smtp(_at_)imc(_dot_)org
Precedence:  bulk

On Fri, 13 Nov 1998 02:31:58 +0300 Alexey Melnikov 
<mel(_at_)taxxi(_dot_)com> wrote:

There are also multiple reasons why this would be a bad idea.
They include reintroducing a reason for explicit source routes


So that one can specify different ports at different hops.  If 
there is enough requirement for this to introduce a protocol/ 
syntax change, then there ought to be enough that I might want 
to use it down a successively-better-preference MX path.  But 
the DNS can't accomodate different port numbers, so one might 
 <@host1:port1, @host2:port2, @host3: user(_at_)host4:port4>
note this also points out a little problem with the syntax you 

I am not insisting on using <username>@<server>:<port> syntax.
I would like to know how this idea was implemented (if it was) : server is
specially configured to connect particular server on non standard port (i.e.
the use of configuration files), server uses DNS Well-known service record or
Service Location Protocol, other ways.

To the best of my knowledge, this has been done by private 
client-side (more generally, sender-side) configuration and out 
of band communication about the ports to use.  There are no DNS 
or SMTP facilities for specifying funny ports in an address.