Forgot Password link generates email with the hostname instead of a valid URL with the service name.

Forgot Password link generates email with the hostname instead of a valid URL with the service name.

As above. When clicking on the 'Forgot Password?' link, an email is sent to the requester, which  looks similar to the below:
https://[hostname]:443/login/ForgotGAuthPassword.jsp?TYPE=GAuth&KEY=[...]
This results in the name mismatch with the certificate flagged up by the web browser when navigating to the above link. How can we change the [hostname] bit in the link above to represent the actual name of our PMP service, more like:
https://password.ab.cd.ef:443/login/ForgotGAuthPassword.jsp?TYPE=GAuth&KEY=[...]?
I've gone through the config files etc., but can see the 'Forgot Password?' link is using the '/login/ForgotPassword/jsp' script, which isn't located on the machine.