Plesk mail not working 10024: Connection refused

On a Plesk mail server, when sending/reciving email, it fail with following error in /var/log/maillog

To fix, reinstall email-security extension.

Verify mail works. If all good, you can reinstall the Plesk mail security extension from Plesk admin

If its mail configuration issue, you can run

Plesk Mail not working amavis error

See Plesk

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