Missing "Warning! Your mail is not delivered for past ... hours"

[Christoph Erhardt]

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:
> 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

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