Hi Ehud,
It seems that the “sendmail” action isn’t added to the built-in jails. You can have a look at Fail2Ban Jails Management on our documentation portal. In case this doesn’t help, we suggest creating a ticket for our dedicated Plesk Support. Thank you.
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It seems the Fail2Ban email notification configuration does not suit current server configuration as well as using a few log files per rule, not generating the email alerts.
What should be the configuration fixes, so emails are sent?