[Labs-l] Fwd: Mail delivery failed: returning message to sender

[Merlijn van Deen (valhallasw)]

On 30 October 2016 at 00:16, Martin Urbanec <martin.urbanec at wikimedia.cz>
wrote:

> I receive mails like this one now. Why? This always worked correctly.
>
>
Hard to say, but:

 ---------- Forwarded message ---------

> Date: so 29. říj 2016 3:00
>
...


> Date: Sat, 20 Aug 2016 00:00:29 +0000
>

suggests this is a message that has been queued up for a while (to say the
least). Looking at the headers, the Received: header from tools-mail is
missing, which suggests that this email was stuck on tools-cron-01. This is
what I think happened:

 - On August 20, there was some sort of outage, where tools-cron-01 could
not deliver emails. After retrying delivery, tools-cron-01 gives up, and
tries to send a 'failed' email
 - The 'failed' email can also not be delivered. This email ends up in an
error queue and stays there
 - Last week, the box was rebooted, and a large number of these failure
emails get sent out.

I'm not 100% certain about this (your email did not include the headers of
the Mail Delivery System email), but in any case, mail from tools-cron-01
seems to be currently functional.

Merlijn
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