Updated August 28th, 2024
What Is Dynamic SPF Flattening? (Visually Explained)
The Sender Policy Framework (SPF) is an important addition to email security. However, senders with large email volumes quickly run into its limitation of prohibiting more than 10 DNS lookups. This means that their SPF record cannot host all sending services that the sender uses to send their emails. Dynamic SPF Flattening solves SPF’s limitation of max. 10 DNS lookups: The SPF record is reformatted to host all sending services with fewer DNS lookups by removing include terms and adding their IP addresses directly to the main SPF record. An automatic system keeps this reformatted record up-to-date.
