failed to send email after upgrade from Zabbix 5.0 to 6.0 LTS

[Cloud8x4]

Hi,

Until last week, I used Zabbix 5.0 LTS on a zabbix web and a zabbix server docker via docker-compose.

I had several actions working, using the following configuration mail configuration.



After the upgrade, using docker-compose, e-mails are not sent.

The docker log shows `failed to send email: Timeout was reached: Connection timed out after 40001 milliseconds`.

I tried changing the port from 587 to 465 and 25.

I tried setting the username and password again.

Running `telnet email-smtp.eu-west-1.amazonaws.com 587` results in `220 email-smtp.amazonaws.com ESMTP SimpleEmailService-d-23UDTQ3MO 5GJgwrIGumdOLTspYliE`. I don't expect that suddenly something changed in the network so the SMTP service should be available.

I tried turning off authentication.

I tried creating a new media type using the same settings.

Please help.

Thanks in advance.

[Cloud8x4]

Yesterday I followed the instructions in the Zabbix 6.0 upgrade manual to add primary keys.

Sources

https://www.zabbix.com/documentation/6.0/en/manual/appendix/install/db_primary_keys#mysql

https://git.zabbix.com/projects/ZBX/...35c88a02dc8365 .

So I stopped the zabbix dockers and ran the procedure.

After starting the docker for the zabbix-server again, the logs then showed `failed to send email: Login denied` instead of the timeout message earlier.

Renewing the credentials in Amazon and the updating the media type credentials via zabbix web hen solved the issue.

E-mails are sent again.

So it is unclear what was the cause of the issue and what exactly the solution, but I'm happy it works again.