Setting up hosted Exchange mail to work on your domain can be complicated, but these instructions should help.

Setting Up Your Domain's DNS Record (For a technical person)

1. CNAME record for autodiscover.yourdomain.com needs to point to adr.websitevalet.com.
2. CNAME record for exchange.yourdomain.com needs to point to exchange.websitevalet.com.
3. MX records
   Primary / priority = 0; Server Name = exch1.websitevalet.com
   Secondary / priority = 5; Server Name = exch2.websitevalet.com