Outbound notification email gets stuck and never recovers if the email server in temporarily unavailable

Technical assistance
1

Infos:

Used Zammad Version:

  • 6.4.1-173684

7225.e899e544.noble

Environment:

  • Installation method: package

  • Operating system (if you're unsure: cat /etc/os-release ): ubuntu 24.04

  • Database + version: postgresql 16.6

  • Elasticsearch version: 8.17

  • Browser + version: firefox 134, edge 131

Expected behavior:

What should happen is that the email server is re-checked at a proper interval (let’s say every minute) and it should come back to life by itself, without human intervention.

Actual behavior:

If the email server for notification is temporarily unavailable for some reasons (i.e. I had to shut down the mail server for some minutes), the outbound notification email get stuck and never recover.
I see these errors in the log:

E, [2025-01-15T07:15:55.458843#54149-183620] ERROR -- : Can't use Channel::Driver::Smtp: #<Net::SMTPServerBusy: Net::SMTPServerBusy>
E, [2025-01-15T07:15:55.458960#54149-183620] ERROR -- : 450 4.7.1 Error: too much mail from X.X.X.X

Then I need to edit the outbound notification email, click continue and it comes back to life again.

Steps to reproduce the behavior:

Make the notification email server unavailable and send an email as a customer

2

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