[Mailman-Users] 4.3.0 mail transport unavailable

Conrad G T Yoder cgtyoder at alum.mit.edu
Sun Jun 15 19:50:12 CEST 2014

On Jun 14, 2014, at 1:03 PM, Mark Sapiro <mark at msapiro.net> wrote:

> On 06/14/2014 09:22 AM, Conrad G T Yoder wrote:
>> I have recently (last couple weeks?) started getting "4.3.0 mail transport unavailable” bounces from roadrunner/TW addresses (the rate-limiting issue is not currently rearing its head), and that is causing Mailman (2.1.17) subscriptions to be disabled.  Example error message in the “Bounce action notification” email:
>> Reporting-MTA: dns; zapata.dreamhost.com
>> X-Postfix-Queue-ID: B6D6B8DB0B72
>> X-Postfix-Sender: rfc822; neohiopal-bounces at lists.neohiopal.org
>> Arrival-Date: Mon,  9 Jun 2014 05:15:45 -0700 (PDT)
>> Final-Recipient: rfc822; foo at roadrunner.com
>> Original-Recipient: rfc822;foo at roadrunner.com
>> Action: failed
>> Status: 4.3.0
>> Diagnostic-Code: X-Postfix; mail transport unavailable
>>> From googling it appears this is may be a Postfix problem?   Any one else seeing this with roadrunner/time warner?
> Yes, it would seem to be a problem with Postfix at zapata.dreamhost.com.
> Is dreamhost.com your Mailman host or a downstream relay in this case?
> If they are your outbound MTA, it seems strange that this would affect
> only mail to the roadrunner.com domain, but in any case, I think it's up
> to Dreamhost to fix it.

DH is indeed my Mailman host.  If you remember, I was (hopefully all in the past - knock on wood laminate) having issues with RR/TW rate-limiting mailing list emails from DH’s server, causing bouncing/subscription disabling.  Who knows if this is related.  I am in touch with them to see what is going on.


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