Go to Gmail Settings
Click See all settings
Click Accounts and Import
Look for Send mail as:
Click Add another email address
Enter Name and Email Address (name@yourwebsite.com)
Click Next Step
SMTP Server: (ask our support about this) e.g. cloud33.hostgator.com
Username: (name@yourwebsite.com)
Password: Use the password of name@yourwebsite.com
Port: 465
Click Add Account
Now go back to you Gmail Inbox and click the confirmation link