On Fri, 5 Oct 2012, Timothy Pearson wrote:
>>
>> My (email) ISP said "sender domain does not exist".
>
>This *should* be fixed as of a week or two ago; can you confirm?

Confirm a not-failing?  heh...
As a close colleague of mine once said for a LARGE piece of corporate
software we built and maintained: "It is not known not to fail."
I think we'll have to set this aside and see if it never happens again.

My last "Fail" notification was received yesterday:

  From: trinity-users-help@...
  To: trinity@...
  Date: 4 Oct 2012 08:52:06 -0000
  Subject: warning from trinity-users@...

but the report was for a list message dated Sept 22:

  Reporting-MTA: dns; vali.starlink.edu
  X-Postfix-Queue-ID: AA46E456024C
  X-Postfix-Sender: rfc822;
    trinity-users-return-3615-trinity=jonz.net@...
  Arrival-Date: Sat, 22 Sep 2012 10:43:34 -0500 (CDT)

  Final-Recipient: rfc822; trinity@...
  Original-Recipient: rfc822;trinity@...
  Action: failed
  Status: 5.7.1
  Remote-MTA: dns; mx1.operationenterprise.com
  Diagnostic-Code: smtp; 550 5.7.1 sender domain does not exist

Why the bounce was 'held' for 12 days before I was "warned" is strange.
I don't think the MTA for pearsoncomputing.net re-tried the message
every day for 12 days and then reported - by date- the first failure.

I'll reply to this list message if I see another "warning".

Regards,
Jonesy