Underlying link is wrong - TD

A client of ours mentioned that they couldn't use the link to get back to the portal and see her account.

We renamed our original link http://abc.companyname.co.uk:8080 to a more "memorable": http://servicedesk.companyname.co.uk:8080.

The text in the outgoing email message shows:
http://servicedesk.companyname.co.uk:8080/WorkOrder.dowoMode=viewWO&woID=294

but the actual hyperlink it contains is:

http://abc.companyname.co.uk:8080/http://servicedesk.companyname.co.uk:8080/WorkOrder.do?woMode=viewWO&woID=294

I have looked at the settings in Admin Settings and they look correct.

Has anyone got an idea where the programme is picking the erroneous path from please?

Thanks