Spammers almost always forge the sending email address on the spam that they send. The result is that the actual owner of the spoofed email address can become overwhelmed with bounceback emails, and sometimes the recipient of venomous replies from the spammed. One step that you can take to help validate an email that is actually generated by you, and invalidate an email that is falsely using your email address, is to add an SPF record to your account.
An SPF record is a line added your DNS record that tells the recipient mail servers which sending servers are permitted to send email on behalf of your domain.
1. Login to the cPanel for your hosting package, commonly found at http://www.yourdomainname.com/cpanel (yourdomainname.com should be replaced with your actual domain name)
2. Click on the Email Authentication module, located under the Mail section of your cPanel.
3. Scroll down to the SPF section of the Email Authentication module. Click the Enable button next to Current Status.
4. You will see that the cPanel has automatically created an SPF record for you. In most cases, this will be enough information with no configuration required. Click Go Back.
5. If you (or anyone using an email address on this account) send mail through a mail server other than MacHighway's, scroll down to the Include List (INCLUDE): section. Click the Add button.
6. Enter the domain name at the end of your sending mail server. As an example, if you send via smtp.earthlink.net, you would enter: earthlink.net. Click OK.
7. Scroll to the bottom of the page and click Update to Save Changes.
Congratulations. You now have an SPF record created for your email accounts.
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