email link in alerts

list Usa Ims
Tue, 10 May 2016 15:25:22 +0000 (UTC)
Message-Id: <user-f900e3043955@xymon.invalid>

How can I change the email URLS in the alert emails?
I want to change
See http://narfy/xymon-cgi/svcstatus.sh?HOST=IllinoisAPI&SERVICE=IllinoisApiTest
to
See http://192.168.1.40/xymon-cgi/svcstatus.sh?HOST=IllinoisAPI&SERVICE=IllinoisApiTest