By default, Sendmail is not configured to receive mail for any host or network other than the machine on which it is running. So you must first configure Sendmail to permit anyone to send mail for delivery to your domain through your server. Open the Local Domains page, and enter the domains for which your server will accept mail. In my case, I would enter swelltech.com. Any number of domains can be entered here, as can host names, so I could also enter www.swelltech.com if ever I expected mail to be delivered to that address.
Click the Save button to update the sendmail.cf file. This will add new Cw lines to include your specified domains.
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