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<p>Hi Valentin,</p>
<p>Christoph is right. When the message is not rejected because of
not conform to incoming policies and should be delivered, then
postfix will try it to deliver. When it fails to deliver, the
message is put to deferred queue. The next attempt for delivery is
tried after few seconds. But time between each attempt is always
doubled. It is because to not overhelm postfix with a lot of
unsuccessful messages.<br>
<br>
By default there is a time limit of 5 days after which is message
considered as undeliverable and then is bounced to the sender
(notification about unsuccessful delivery). You can change this
settings:<br>
<a class="moz-txt-link-freetext" href="http://postfix.its.cz/postconf.5.html#maximal_queue_lifetime">http://postfix.its.cz/postconf.5.html#maximal_queue_lifetime</a><br>
<br>
I have one note here. You can't expect that two different programs
have same behavior.<br>
<br>
So to complete the answer to your question. No configuration
issue.<br>
Just the default behavior.</p>
<p>Best Regards<br>
Thomas<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 8/19/20 6:35 PM, Christoph Erhardt
wrote:<br>
</div>
<blockquote type="cite" cite="mid:4554897.GXAFRqVoOG@delle">
<pre class="moz-quote-pre" wrap="">Hi Valentin,
the undelivered emails were probably not rejected but have piled up in your
Postfix delivery queue. Postfix will periodically retry to deliver the
contents of the queue. If the queue grows beyond a given maximum, old messages
are dropped.
As far as I'm aware, that's the default setting.
On my personal server, I have set up an Icinga check that alerts me via XMPP
whenever the mail queue exceeds a certain threshold. For obvious reasons, an
email notification doesn't suffice here... ;-)
Best,
Christoph
On Wednesday, 19 August 2020 14:16:02 CEST Valentin Laskov wrote:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">Hello,
FYI
I installed experimental Kolab server on SSD disk and after troubles
with Cyrus-imap database files, cyrus-imapd was not running for two days.
As a sendmail user, I was expecting undelivered mail alerts. Sendmail
sends such messages to the sender every 4 hours by default. But nothing
like that. Postfix in my Kolab system receives letters from the remote
MTA and tries to deliver them to cyrus-imapd, which fails. During this
time, no alerts are sent to the sender.
Or it is a configuration issue?
Regards!
Valentin Laskov
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">
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