On Wed 17 Aug 2016 at 18:44:59 -0400, Jeffrey Mark Siskind wrote:

[...Quite a bit of snipping of very useful information].

> I just changed /etc/mailname on all of my machines to contain:
> 
> qobi@upplysingaoflun>cat /etc/mailname
> purdue.edu

You know it makes sense to do this. :)

> qobi@upplysingaoflun>ls -l /etc/mailname
> -rw-r--r-- 1 root root 11 Aug 17 18:08 /etc/mailname
> qobi@upplysingaoflun>
> 
> It does not deliver mail that is addressed to either qobi or root without @...

But it does qualify a bare qobi or root correctly.

> The enclosed may help. I don't know how to interpret them. They come from
> procmail on dynamo.ecn.purdue.edu, a machine that I don't maintain.
> 
>     Jeff (http://engineering.purdue.edu/~qobi)
> -------------------------------------------------------------------------------
> From mailer-dae...@ecn.purdue.edu  Wed Aug 17 18:10:20 2016
> Return-Path: <mailer-dae...@ecn.purdue.edu>
> Received: from mx05.ecn.purdue.edu (mx05.ecn.purdue.edu [128.46.4.13])
>       by dynamo.ecn.purdue.edu (8.14.4/8.14.4) with ESMTP id u7HMAKUs029433
>       (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 
> verify=NOT)
>       for <q...@dynamo.ecn.purdue.edu>; Wed, 17 Aug 2016 18:10:20 -0400
> Received: from mailhub180.itcs.purdue.edu (mailhub180.itcs.purdue.edu 
> [128.210.5.180])
>       by mx05.ecn.purdue.edu (8.14.4/8.14.4) with ESMTP id u7HMAJFV019693
>       (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT)
>       for <q...@ecn.purdue.edu>; Wed, 17 Aug 2016 18:10:19 -0400
> Received: from mailhub130.itcs.purdue.edu (mailhub130.itcs.purdue.edu 
> [128.210.5.130])
>       by mailhub180.itcs.purdue.edu (8.14.4/8.14.4/spamscan) with ESMTP id 
> u7HMAJYX008224
>       for <q...@purdue.edu>; Wed, 17 Aug 2016 18:10:19 -0400
> Received: from smtp.ecn.purdue.edu (mx05.ecn.purdue.edu [128.46.4.13])
>       by mailhub130.itcs.purdue.edu (8.14.4/8.14.4/mta.smtp.purdue.edu) with 
> ESMTP id u7HMAIWv018160
>       (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT)
>       for <q...@purdue.edu>; Wed, 17 Aug 2016 18:10:19 -0400

qobi has been qualified by Exim. The mail is accepted and makes its way
to dynamo.ecn.purdue.edu.

> From: Mail Delivery Subsystem <mailer-dae...@ecn.purdue.edu>

And then gets rejected :(

[...Snip...]

for this reason:

>    ----- The following addresses had permanent fatal errors -----
> <q...@upplysingaoflun.ecn.purdue.edu>
> 
>    ----- Transcript of session follows -----
> 554 5.0.0 MX list for upplysingaoflun.ecn.purdue.edu. points back to 
> smtp.ecn.purdue.edu
> 554 5.3.5 Local configuration error

A mail loop, if I am not mistaken. My thoughts would now be turning to a
server misconfiguration.

[...A big snip...]

Let's try to pin this down and determine whether Exim plays a part.

  brian@desktop:~$ telnet smtp.ecn.purdue.edu 25
  Trying 128.46.177.5...
  Connected to smtp.ecn.purdue.edu.
  Escape character is '^]'.
  220 smtp.ecn.purdue.edu ESMTP Sendmail 8.14.4/8.14.4; Thu, 18 Aug 2016 
08:04:08 -0400
  ehlo example.com
  250-smtp.ecn.purdue.edu Hello copernicus.demon.co.uk [80.177.21.246], pleased 
to meet you
  250-ENHANCEDSTATUSCODES
  250-PIPELINING
  250-8BITMIME
  250-SIZE 314572800
  250-DSN
  250-ETRN
  250-STARTTLS
  250-DELIVERBY
  250 HELP
  mail from:br...@example.com
  530 5.7.0 Authentication required

You'll be able get further than me and see how the server handles rcpt 
to:q...@purdue.edu.

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