SPF Record Builder
Build your SPF record by selecting your email providers. We track DNS lookups automatically.
SPF Best Practices
Understanding the 10-Lookup Limit
SPF allows a maximum of 10 DNS lookups. Each include:, a:, mx:, and redirect= counts as one lookup. ip4: and ip6: do not count.
Tips for Staying Under the Limit
- Use
ip4:andip6:instead ofinclude:where possible - Consolidate services that share infrastructure
- Consider SPF macro hosting for complex setups
- Remove includes for services you no longer use
Hard Fail vs Soft Fail
-all (hard fail) tells receivers to reject emails from unauthorized sources. ~all (soft fail) marks them as suspicious but still delivers. Use -all once you are confident all senders are authorized.