[Xymon] configurable sender email address for alerts?

I have a FreeBSD bug report open from a user who claims that if they run "sudo service xymon-server start" it starts xymon correctly but the alert emails come from the wrong email address. Where is Xymon getting the username from to use when sending emails? Is it configurable in xymonserver.cfg? Could it be made configurable? The patch the user suggested to the freebsd rc script seems unnecessary.

Thanks