How to modify recordurl to website domain address

Hi,

Have created send mail from work flow and it has recordurl option, By default it generate with server hostname but this issue is causing to external user.

Server hostname is crm and external link is crm.tjp.com but it generate only http://crm/recordurl

I also modified on IIS bindling the hostname but no luck.

How to change server host to website name ?

Regards

Faisal