What Is SPF?

Dec 12, 2020

SPF (Sender Policy Framework) is an email authentication system that uses DNS (Domain Name System) to check if the mail server is authorized to send emails from your domain.

Advantages Of SPF

SPF helps protect your domain from spoofing (third-parties sending messages that appear to be coming from your domain) and ensures your messages are delivered correctly. 

This way, a remote mail server can check and make sure that the email sent from your domain (or a spoofed domain) is authorized to send emails via a DNS SPF record. If it’s not – the message will end up in spam, and if it is – it will land in the inbox. 

As you can see, it’s vital to use SPF records in the DNS configuration of your domain to ensure proper email delivery.

In short, SPF helps:

  • Increase your email delivery
  • Prevent domain impersonation and spoofing
  • Increase your brand reputation

Please note that SPF doesn’t check the From domain but instead looks at the Return-Path to verify the originating server. The Return-Path is the email address where receiving servers send notifications of delivery problems to the sending servers, like bounces, errors, etc.

SPF In Action

Here’s how the email delivery looks like when using SPF:

Here’s how the generic SPF DNS record looks like:

v=spf1 ip4: +a +mx ~all

Skystra SPF

Please note that Skystra automatically sets up the SPF record for your domain if your domain is pointing to our nameservers. 

That means if your domain name is pointing to our nameservers, you’re already protected with SPF.

This is the Skystra SPF record:

v=spf1 ip4: include:relay.mailchannels.net ip4: ip4: +a +mx ~all

How To Edit SPF Records Manually

If your domain name is hosted with us but you’d like to opt-out of our SPF record and put in your own, you can follow the steps below.

It’s very important you first delete the existing SPF record before you add your own, or else the system will work.

Two SPF records can’t exist at the same time on the same domain name.

Log in to your cPanel control panel, and click DNS Zone Editor under the Domains section:


Click Manage next to the domain you’re editing SPF the record for:

Edit SPF Record

Next, find the existing Skystra SPF record: 


Delete the Skystra SPF record and fill in your own SPF entry under the Record column.

Here is our example using a generic SPF record:

Add Record

Click Add Record to save changes.