Solved Windows Mail - reply address

I have 2 e-mail addreses set up in Windows Mail. One is a gmail account and the other is from my ISP provider (Homecall.co.uk). I have set gmail as the default address and put the gmail account in the "reply to" in the Homecall account properties.

When I send a message from Gmail an then someone "replies" t mthe message, it automatically inserts the Homecall account! How does this happen? how can I stop it?

Many Thanks

Apologies, I had the "reply to" on the gmail account going to Homecall/