SPF Advanced - How to add more than 10 references

Here is an older article on SPF Basics https://koppihle3.blogspot.com/2016/04/dns-spf-basics-what-you-need-to-know-to.html to add to that...

While you can only have ONE official SPF record for your domain, If your domain requires more include statements than you can fit on one SPF record (limit should be10). 

It is DNS acceptable to create references to additional txt records that can include other SPF references but it is important to end all of them with a ~all. This is a common issue if you have several marketing or other services sending email for your domain or a monster domain such as Microsoft.com . 

Note: Subdomains are handled separately and can have their own official SPF record. for Example for Microsoft using MXtoolbox.com to lookup the data:


References include statements to other records: 








So Rules are still. Put SPF records in priority access for example if your email primarily comes from proofpoint, put that first then any third party references such as SMTP IP's or mail services (mailchimp, constant contact...) Errors in SPF can kill outbound delivery as fast as a bad MX records.

The more services listed the more that can relay good or bad for your domain so keep it clean and neat as possible.


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