Although there is no harm in using multiple email services, creating more than one SPF record never favors your domain’s reputation. Thus, it’s always better to merge SPF records to keep using different email services without any errors and deliverability issues. So, let’s find out how you can merge SPF records to stay away from a variety of email mishaps.
Structure of an SPF Record
It becomes quite easy to combine the SPF records when you understand the structure of the same. Hence, here are a few points that you should know before merging the SPF records:
- An SPF record begins with the “v=spf1” modifier
- The same record is made up of one or more rules
- A rule can be further broken down into an optional prefix, a mechanism, and an optional value
- The value of the prefix is set to pass “+” by default but you can change it as per your preference
- A colon “:” is used as a separator between the mechanism and its value
- The “all” mechanism is always placed at the end of the record to specify a default response for all the unmatched senders
Prefixes and Their Effects
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The following list of prefixes has been created to let you learn more about the same:
- The pass “+” prefix makes the matching senders pass the SPF verification
- The fail “-” prefix makes the matching senders fail the SPF check
- The soft-fail “~” prefix makes the senders that match the given mechanism soft-fail the SPF validation
- The neutral “?” prefix treats the matching senders as neutral
If you want to gain more clarity about the fail “-” and soft-fail “~” prefixes, then we have written another detailed article to observe the difference between SPF -all and SPF ~all. Please click on the linked text to enhance your knowledge.
Merge SPF Records With Ease
You can merge SPF records by bringing together the required records. It can be done by adding more “include” mechanisms, one for each email sender’s domain. Also, don’t forget to set all the required mechanisms suggested by the email services. Lastly, ensure that the final merged SPF record starts with the “v=spf1” modifier and ends with the “all” mechanism.
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SPF Merging Example
Let’s say, your domain is already authenticated through MailChimp and your current SPF record looks like this:
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v=spf1 include:servers.mcsv.net ?all
But now, you want to authorize another email service such as Outlook.com along with the MailChimp, and the suggested SPF record by the former looks similar to this:
v=spf1 a include:spf.protection.outlook.com -all
In this case, you’ll merge SPF records by combining the rules of both of the above records. Please note that you don’t need to repeat any common mechanisms. Moreover, the mechanisms that exist in only one SPF record will be added at the beginning. So, the final merged SPF record will look like this:
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v=spf1 a include:spf.protection.outlook.com include:servers.mcsv.net -all
Clearing Out the Prefix Confusion
Are you wondering why the merged record is ending with “-all” while the individual records had “?all” and “-all” at the end? The reason behind using the fail “-” prefix is its effectiveness. Still, some of the email service providers suggest SPF records with “?all” on the safe side. It is because they don’t know enough about your domain setup and don’t want any email deliverability errors on your domain.
Note that setting up your first SPF record with “-all” might get your all emails rejected by the receiver. But once you’ve finalized your list of authorized senders, you can merge SPF records and end the same with the “-all” mechanism.
Summarizing
You can merge SPF records by combining the rules of the individual SPF records. It is that easy and won’t take much of your time. We hope that this article solved your query. Please feel free to come back to get a quick revision of the SPF merging process.
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