Same problem here when trying to set up smtp relay for outbound email channel. I used the docker-compose set up.
it seems that this problem occurs when some batch processing of tickets or a batch of some timed tickets are opened synchronously.
We just investigated that there are message rate limits with microsoft exchange:
Message rate limits and throttling | Microsoft Docs
Maybe it is somehow possible to let batches of tickets to be processed with some time delay?
Okay i´ve found out that my SMTP relay does not used SSL/TLS and there is no option to disable the usage of SSL/TLS in the email channels settings.
are there any news on this issue? We still have issues when closing multiple tickets in batch or a lot of tickets one by one. Randomly our zammad installation tells us in Channel-settings that it “Can’t use Channel::Driver::Smtp: #<EOFError: end of file reached>”.
Please keep this thread open.
We have found a workaround/configuration option for our use case.
With the following command you can see the configured “MessageRateLimit” on your onPrem Exchange-servers:
Get-ReceiveConnector | ft name,MessageRateLimit
For us it worked out to higher the configured limits on each server.
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