Few emails are neither registered nor getting suffixed from the Splunk SIEM solution.
A TCP dump from the server to identify whether the logs with the email address email@example.com are coming directly from the PA firewall shows that those are from the PA-5220 firewall.
Is any email address suffixed on PA Syslog shall it can be removed the email address from the Syslog if there is a hidden configuration setting that exists on PAN-OS.
email addresses contained in sessions will not be replaced by the firewall
you can however create an smtp profile in log forwarding/server profiles and freestyle any email address you like in there. search the configuration for this mail address
> set cli config-output-formet set > configure # show | match firstname.lastname@example.org
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