Rogers block out Re:Need an ISP in TO

[Taavi Burns]

On 6/29/05, James Knott <james.knott-bJEeYj9oJeDQT0dZR+AlfA at public.gmane.org> wrote:
> ted leslie wrote:
> > runing an isp and adminsitering a few more,
> > this rogers smtp off load over the last couple of days has been weird.
> > Rogers soln:
> > go to port 587 (they suggested)
> > and put a firewall rule in at smtp source to map that  to 25,
> > i did that for myself (isp) and another and works like a charm, only issue is,
> > all the rogers peopl ehaev to change there smtp port set up in their client.
> 
> Why not use port 465, which is the SSL port for SMTP servers.  Any
> decent mail client should be able to support it.

Well, if you're not going to be sending SSL traffic over port 465, it
seems silly.

Port 587 actually looks like a reasonable port to use in lieu of 25,
particularly given the context of individual users' MUAs submitting
e-mail (the common case for Rogers customers):
$ grep 587 /etc/services
submission      587/tcp                         # Submission [RFC2476]
submission      587/udp

Which can be found at:
http://www.apps.ietf.org/rfc/rfc2476.html

Specifically related to the current discussion:
<excerpt>
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.
</excerpt>

-- 
taa
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