[RndTbl] mail server help

[Micah Garlich-Miller]

I forgot to mention: the timestamps on your problem emails happen before
they started work on the ironports. So I don't think it's related.

On Thu, Aug 17, 2017 at 10:21 AM Gilbert E. Detillieux <
gedetil at cs.umanitoba.ca> wrote:

> Trevor,
>
> The problem may be at your end.  (Have you changed anything there
> recently?)  My reply to your address bounced when sent from my sendmail
> server, which hasn't changed in a long time.  Here's what I got in the
> bounce message...
>
>     ----- The following addresses had permanent fatal errors -----
> <trevor at tecnopolis.ca>
>      (reason: 550 <trevor at tecnopolis.ca>... 451 4.7.1 Greylisting in
> action, please come back later)
>
>     ----- Transcript of session follows -----
> ... while talking to tecnopolis.ca.:
>  >>> DATA
> <<< 550 <trevor at tecnopolis.ca>... 451 4.7.1 Greylisting in action,
> please come back later
> 550 5.1.1 <trevor at tecnopolis.ca>... User unknown
> <<< 503 5.0.0 Need RCPT (recipient)
>
> --v7HEwiKb114371.1502981924/copper.cs.umanitoba.ca
> Content-Type: message/delivery-status
>
> Reporting-MTA: dns; copper.cs.umanitoba.ca
> Received-From-MTA: DNS; lockwood3.cs.umanitoba.ca
> Arrival-Date: Thu, 17 Aug 2017 09:58:37 -0500
>
> Final-Recipient: RFC822; trevor at tecnopolis.ca
> Action: failed
> Status: 5.1.1
> Remote-MTA: DNS; tecnopolis.ca
> Diagnostic-Code: SMTP; 550 <trevor at tecnopolis.ca>... 451 4.7.1
> Greylisting in action, please come back later
> Last-Attempt-Date: Thu, 17 Aug 2017 09:58:44 -0500
>
> On 17/08/2017 3:22 AM, Trevor Cordes wrote:
> > I just started getting some weirdness with some email sent to my mail
> > servers.  Greylisting "come back later" (451) messages are being
> > interpreted (it appears) by remote MTAs as a 5xx level error, meaning
> they
> > immediately abort send attempts and bounce the email!  I have never seen
> > this before.
> >
> > I've seen it from two separate remote MTAs so far, but from reports I'm
> > getting in, it's happening on more.
> >
> > Here's what I get from umce3cip03.ad.umanitoba.ca:
> >
> > Remote Server returned '554 5.0.0 <[50.71.247.87] #5.0.0 smtp; 5.1.0 -
> > Unknown address error 550-'<foobar at tecnopolis.ca>... 451 4.7.1
> Greylisting
> > in action, please come back later' (delivery attempts: 0)>'
> >
> > On my server sendmail log I see:
> >
> > Aug 16 08:43:15 pog sendmail[14379]: v7GDhFav014379: Milter:
> > to=<foobar at tecnopolis.ca>, reject=451 4.7.1 Greylisting in action,
> please
> > come back later
> >
> > So umce3cip03.ad.umanitoba.ca appears to be taking my 451 and turning it
> > into a 500/554/510 permanent error.
> >
> > I also see this from yahoomail, but that's a different situation because
> > yahoo is always considered "broken mta" in milter-greylist and we must
> > whitelist all of their servers... but, the usual/previous symptom was
> > yahoo would keep retrying as normal, just with a different IP each time,
> > thus never passing greylisting.  And now yahoo is doing the same thing as
> > umce3cip03.ad.umanitoba.ca above (when I haven't yet whitelisted the
> > particular IP that day, grrr):
> >
> > Sorry, we were unable to deliver your message to the following address.
> > <foo at tecnopolis.ca>:
> > 550: <foo at tecnopolis.ca>... 451 4.7.1 Greylisting in action, please
> > come back later
> ...
>
> --
> Manitoba UNIX User Group        E-mail: <gedetil at muug.ca>
> c/o Gilbert E. Detillieux       Web:    http://muug.ca/
> University of Manitoba          Phone:  (204)474-8161
> Winnipeg MB CANADA  R3T 2N2     Fax:    (204)474-7609
> _______________________________________________
> Roundtable mailing list
> Roundtable at muug.ca
> https://muug.ca/mailman/listinfo/roundtable
>
-- 
Micah Garlich-Miller <micahgarlichmiller at gmail.com>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://muug.ca/pipermail/roundtable/attachments/20170817/fe25ab26/attachment.html>