I have a simple solution - don't be dependent on the whims of your ISP for mail servers.  I'm using Tucows/OpenSRS for my globally accessible (authenticated) SMTP server, which also means I won't be rejected for "relaying" if I connect my laptop to the Internet at some other premises than my own.
 
Also, for good measure, I am using this same SMTP server at Gmail, where (policy change in Sep 2014) any newly created "from" address requires you to supply your own SMTP server (a BYOS policy - "bring your own server").
 
For a Tucows/OpenSRS reseller, that SMTP server costs $0.50 per month - a negligible cost.
 
Regarding MTS, I believe they recently switched from MS Live/Hotmail/Outlook to something else for their mail service offering (@mymts.net).
 
Hartmut W Sager - Tel +1-204-339-8331


On 25 April 2015 at 01:31, Trevor Cordes <trevor@tecnopolis.ca> wrote:
Great, Shaw is playing with email things again :-(

All of a sudden all emails from my box (on a shaw cable modem) outgoing
(via Shaw's recommended smarthost) were being blocked by Shaw.  They
blocked me from 1am to 4:30pm.

I've been using this setup for 10+ years and never had a problem.  They
must have switched to a new email outsource service or something.

Even funnier, what triggered it seems to be this: I'm trying to help my
customer with Spam problems and the RT ticket he made (and hence email
subject) had the word "Spam" and Shaw barfed it back and started the
blocking without warning:

=========================
Date: Fri, 24 Apr 2015 01:07:55 -0500
From: Mail Delivery Subsystem <MAILER-DAEMON@tecnopolis.ca>
Subject: Returned mail: see transcript for details

The original message was received at Fri, 24 Apr 2015 01:07:54 -0500
from localhost.localdomain [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<customer@mycustomer.com>
    (reason: 552 5.2.0 lWmIYQYgD7S0qlWmJYSEv0 spam rejected)

   ----- Transcript of session follows -----
... while talking to shawmail.wp.shawcable.net:
>>> DATA
<<< 552 5.2.0 lWmIYQYgD7S0qlWmJYSEv0 spam rejected
554 5.0.0 Service unavailable

[...]
Subject: [Tecnopolis #2173] Spam Possible
=========================

Hahaha.  Pathetic.  So any email that wants to talk about spam and has
that word in the subject is blocked?  What if I want to talk about
viagra or rolex, is that blocked too?

All subsequent emails for the whole day got a bounce:

=========================
The original message was received at Fri, 24 Apr 2015 02:54:59 -0500
from localhost.localdomain [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<customer@mycustomer.com>
    (reason: 554 mo23.dcs.int.inet shaw.ca ESMTP server not available)

   ----- Transcript of session follows -----
... while talking to shawmail.wp.shawcable.net:
<<< 554 mo23.dcs.int.inet shaw.ca ESMTP server not available
554 5.0.0 Service unavailable
=========================

WTF is mo23.dcs.int.inet?  Looks new to me.

Anyhow, after a call to a clueless tech rep telling me I'm unsupported
because I run sendmail *simply as an outgoing mail MTA pointing directly
to their smart host* and an email to their (hopefully) more advanced
techs, I got nowhere until it magically fixed itself at 4:30.  I probably
hit their BL timeout or something.

I dare anyone on the Shaw network using normal SMTP outgoing to send an
email with the subject of "sp*m" (I dare not spell it out in full, he who
can't be named and all that).  Let me know if they block you for a day and
whether you get anywhere with tech support.

Shame on Shaw.  Almost getting as bad as MTS.  Wait a minute, no one can
get *that* bad (MS Live mail anyone?). :-)
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