https://www.google.com/support/hoste...y?answer=33352
Configuring Your Mail Exchange (MX) DNS Records
Mail eXchange (MX) records are entries within the Domain Name System (DNS). These records identify servers that handle email for your domain name. To use Gmail for your domain as your email service, you'll need to modify your MX records to point to Google's mail servers. (These records often are set to use your ISP's email servers.)
If you are currently using distinct email addresses at your domain (rather than a single catch-all email address), you should create user accounts in Gmail for your domain for each address before changing your MX records. Otherwise, email sent to those addresses may bounce. Each ISP has slightly different ways to change these MX records. Check out our instructions for changing MX records using some common ISPs.
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GoDaddy.com
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NetworkSolutions.com
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Enom.com
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1and1.com
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DreamHost.com
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Yahoo!SmallBusiness
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DynDNS.com
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Other ISPs