How often do you check for updates?

We rebuild the entire policy every 10 minutes to detect if any changes have been made. If any changes are detected, the flattened policy is updated.

Should I use SPF Flattening if I'm not over the 10 lookup limit?

You're still welcome to use SPF Flattening, but it won't provide any benefit.

Which DNS provider services the flattened record

We use AWS Route53 for our DNS.

How to Setup Dynamic SPF Flatten

Last updated by Stuart Larsen on August 12, 2026

Dynamic SPF Flattening allows you to take SPF policies over the 10 lookup limit, and flatten them to a smaller lookup count.

1. Configure Virtual Policy

Add a Virtual SPF Policy

Go to the SPF Flatten Tab (Domains -> Select a Domain -> SPF Flatten), and click Configure SPF Flattening.

The Virtual Policy is the "source of truth". The flattened policy will be built from the virtual policy.

2. Install DNS Record

Add a Virtual SPF Policy

Follow the given setup instructions to install the DNS record.

Your flattened policy will look similar to:

v=spf1 include:1.6a3d3233838071cff2xxxxxx.spf.dmarcdefender.io ~all

Installation is the same as installing a normal SPF policy. It'll require logging into your DNS provider and creating a TXT record.

Replace your existing SPF policy

If you have an existing SPF policy, do not add an additional SPF TXT record. Replace the existing SPF policy for your domain with the flattened policy.

3. Verify

Refresh the Setup Instructions panel to verify the setup status. You can also verify using the Domain Check tool.