DST has stopped processing mails and they are all stuck in Queue

[Alejandro Santa-Cruz]

Running Version 2.3.21

Just after 3am CEST no more emails are being delivered, they stay in queue and is very difficult to debug as there are no messages or cues at all.

I am 100% sure its the DST because everything worked perfectly until exactly 3am, is it because of the ssl certificates? what's going on?

On the server diagnosis test, the outbound port 25 is timing out:
Testing gmail.com port 25 connection Connection timed out

Connecting via telnet and trying to send email I get:
550 I cannot deliver mail for <[e-mail]>
and the ones to my server <[e-mail]> get processed to the queue, but never sent…

Not sure where is the connection with the time change really, anyone please help!

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[SH]

This is the first time anyone has reported problems with DST, so I suspect it is not a system issue.

On the server diagnosis test, the outbound port 25 is timing out:
Testing gmail.com port 25 connection Connection timed out

Try simply connecting to Gmail from your system. There may be a problem with your ISP.

You can also search logs at logs/s6/haraka-smtp or haraka-submission.

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[Alejandro Santa-Cruz]

Hi! Thank you very much for reaching out, I have been reading those logs and haven’t seen anything in particular suspicious, so really no idea.

It didn’t make sense that DST would affect it, so thanks for reassuring it, it must have been just one of those weird coincidences…

I did try doing a manual nc smtp.gmail.com 25 and it timed out, so realized that it wasn’t necessarily an inherent problem of posteio.

I reached out to the VPS provider and couldn’t give me any hints, but they guarantee they don’t block port 25 (unless malicious usage) so maybe their ISP?

After a few hours system has gotten back to normal… for now.

Thanks for the quick reply!