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Merge multiple SPF records into a single record

To merge SPF values, include all parts into one single record without repeating any mechanisms. Here's how to merge the following example SPF records for Outlook and MailerLite:

Example SPF records:

  • v=spf1 a include:spf.protection.outlook.com -all
  • v=spf1 a mx include:_spf.mlsend.com ~all

Steps to merge SPF records​

  1. The SPF record always begins with the version prefix:

    v=spf1

  2. Both records contain an "a" mechanism and the MailerLite SPF record contains an "mx" mechanism, so include both in the new record:

    v=spf1 a mx

  3. Then add both "include" mechanisms into the record:

    v=spf1 a mx include:spf.protection.outlook.com include:_spf.mlsend.com

  4. Lastly, define how emails should be treated if they don't comply with the set rules. Use the all mechanism. The last part must be either ?all, -all, or ~all. It's not possible to have more than one, so choose which declaration of all your domain will use.

The merged SPF record​

The merged SPF record would look like this:

v=spf1 a mx include:spf.protection.outlook.com include:_spf.mlsend.com ~all