Can anybody help me please..!!

I am recieving my emails fine through my website links and my php contact form.

I use my own domain name for outgoing mail but have a restriction of 500 per day. Does anyone know if this is a simple problem to solve or is this a Windows Mail problem that I have to live with (or go to a marketing company)

Any help would be appreciated.

Paul.
www.008automotive.com " Driving your way"
paul@008automotive.com