SPF Creator vs AutoSPF: SPF Flattening Comparison

AutoSPF is a paid SPF management service that solves the 10 DNS lookup limit by automatically flattening your SPF record. SPF Creator is a free SPF record generator that helps you build records and stay under the 10-lookup limit with real-time feedback. These tools approach the same problem from opposite directions — one helps you exceed the limit, the other helps you avoid hitting it.

The Comparison

What AutoSPF Does

AutoSPF addresses a real problem: organizations that use many email-sending services can easily exceed the 10 DNS lookup limit defined in RFC 7208. AutoSPF solves this by flattening your SPF record — resolving all include mechanisms to their underlying IP addresses and publishing a single, flat record that uses fewer (or zero) lookups.

What SPF Creator Does

SPF Creator takes the opposite approach: instead of working around the lookup limit, it helps you build a record that respects it.

The Key Difference: Build Under the Limit vs. Bypass the Limit

This is the fundamental distinction between the two tools:

• SPF Creator helps you build SPF records and stay under 10 DNS lookups. It gives you visibility into lookup costs so you can make smart choices about which mechanisms to include.
• AutoSPF helps you exceed 10 DNS lookups by flattening includes into IP addresses. It removes the constraint rather than working within it.

The question is whether you actually need to exceed the limit.

The Trade-offs of SPF Flattening

Flattening is not free of risk. Before committing to it, understand what you are taking on:

• Stale records. Flattened records contain hard-coded IP addresses. If a provider adds or removes IPs and the flattening service does not update fast enough, legitimate email can fail SPF. AutoSPF addresses this with automated updates, but the risk still exists during the gap.
• Vendor dependency. Your email authentication relies on AutoSPF's service being operational and accurate. If the service goes down or makes an error, your SPF record is affected.
• Ongoing cost. Flattening is a subscription service because it requires continuous monitoring and updates. This is a permanent line item.
• Complexity. Setting up flattening involves pointing your DNS to the service, which adds a layer of indirection that can make debugging harder.

For a deeper look at flattening mechanics and trade-offs, see our guide on SPF flattening.

When to Use AutoSPF

AutoSPF (or a similar flattening service) makes sense in specific situations:

• You genuinely exceed 10 lookups. You have so many legitimate sending services that you cannot fit them into 10 DNS lookups even after optimizing your record.
• You are an enterprise with many email providers. Large organizations with dozens of business units, each using their own marketing and transactional email platforms, can legitimately hit the limit.
• You cannot consolidate senders. Sometimes the business will not allow you to reduce the number of email providers. Flattening is the pragmatic solution.
• You need automated management. If you do not have the bandwidth to manually update your SPF record when providers change their IPs, automated flattening offloads that work.

When to Use SPF Creator

SPF Creator is the right choice for the majority of domains:

• You can stay under 10 lookups. Most domains can. The real-time counter helps you verify this as you build.
• You want free with no ongoing cost. No subscription, no per-domain pricing, no commitment. Generate your record and move on.
• You want no vendor lock-in. Your SPF record is a standard TXT record that you own and control entirely. It does not depend on any service.
• You want to understand your record. Building the record yourself means you know exactly what is in it and why. Flattening abstracts this away.
• You value privacy. Your domain and DNS data stay in your browser. Nothing is sent to a server.
• You are setting up SPF for the first time. Start by building a record that fits under the limit. If you later discover you need more lookups, flattening is always available as a next step.

Smart Record Design Before Flattening

Before reaching for a flattening service, consider whether you can redesign your record to stay under 10 lookups:

• Audit your senders. Do you actually use every service listed in your SPF record? Remove includes for services you no longer use.
• Use IP addresses directly. If a service sends from a small, stable set of IPs, use ip4: or ip6: mechanisms instead of include:. These cost zero lookups.
• Consolidate providers. If you use three marketing platforms, could you use one? Fewer providers means fewer includes.
• Check nested lookups. Some includes are more expensive than others. Google Workspace's _spf.google.com costs 3-4 nested lookups. Know the true cost of each include.

The SPF lookup limit guide covers these strategies in detail.

The Full Authentication Stack

SPF is just one part of email authentication. Pair it with DKIM and DMARC for complete protection. Use SPF Record Check to validate your published record and confirm your lookup count. And once everything is published, the Deliverability Checker monitors all your records daily so you catch problems before they affect delivery.

Bottom Line

Most domains do not need SPF flattening. The typical setup — one or two email providers plus a transactional service — fits comfortably under the 10-lookup limit. SPF Creator helps you build that record for free, with a real-time lookup counter that makes it easy to stay within bounds.

If you genuinely exceed 10 lookups because of the number of services you authorize, a flattening service like AutoSPF solves a real problem. But try building under the limit first. SPF Creator makes it easy to see whether you actually need to flatten, or whether smart record design is enough.

Monitor Your New SPF Record

You've built your SPF record — now make sure it keeps working. The Email Deliverability Suite watches your SPF, DKIM, DMARC, and MX records daily and alerts you when something breaks.