Configure a server not to receive mail

[ssslippy]

I am on a dedicated server however our server was misconfigured to receive mail so anything that it sent by the phpmailer is being sent to the server which doesnt have a mail client.

Our email is hosted by our web host.

[Dismounted]

Mail is directed by the MX records of a domain - you can changed these by editing your domain's DNS records.

[ssslippy]

Our DNS is also hosted by the webhost and that is configured to send the mail to the right spot.
However our sendmail function only wants to send to localhost.

[Dismounted]

Most likely, you are using Postfix (correct?) and has been configured to send mail to "x.com" locally. Look at the "transport_maps" option in the configuration.

[IronMountain]

Check to see if there is a mail server running like Postfix, if it is, turning it off will usually be a quick fix.

[Dismounted]

If you disable Postfix, he won't be able to send mail in the first place (if he is using its SMTP "module").