Posted by jonas on

How to: Include more than 10 DNS lookups in SPF

I have talked about the benefits of SPF in an earlier article. It’s a crucial part of e-mail security. But you can only have 10 DNS lookups in your SPF. What do you do if you hit that limit?

The solution: is a flattening service designed to solve this problem. They let you list all your SPF records, and they will periodically look up your DNS records to extract the current IPs. All IPs are included under a dynamic SPF record that you can use on your domain.

This is the most elegant solution I have found to this problem, and the pricing isn’t bad either.

Not sure how many DNS lookups you have? Check your SPF health at MXToolbox.

Note: This is not an advert. I am not compensated for my opinions or recommendations on this site.