You can edit and delete existing MX records from the Advanced DNS Settings area of your Domain Control Panel.

To access the Domain Control Panel:

1. Sign in to your Business Control Panel. (If you have not yet signed in with your AT&T Yahoo! ID and password, you'll be prompted to do so here.)
2. Once signed in, you will see modules for each of your domain names on the "Manage My Services" page. Select the "Domain Control Panel" link that corresponds to the domain whose record you wish to edit.

To edit an MX record:

1. Click the "Manage Advanced DNS Settings" link on your Domain Control Panel.
2. Click the "Change MX Records" button.
3. Enter a new mail server host name or select a new priority for an existing record.
4. Click the "Submit" button.

You'll return to the "Advanced DNS Settings" page, and your newly edited MX record will appear in the MX records list. While your changes will appear in the name servers within minutes, please be aware that it can take up to 72 hours for new records to propagate to all name servers on the Internet.

To delete an MX record:

1. Click the "Manage Advanced DNS Settings" link on your Domain Control Panel.
2. Click the "Change MX Records" button.
3. Delete the mail server host name for the record you wish to delete.
4. Click the "Submit" button.

You'll return to the "Advanced DNS Settings" page, where your deleted MX record should no longer appear in the MX records list. While your changes will appear in the name servers within minutes, please be aware that it can take up to 72 hours for record changes to propagate to all name servers on the Internet.