Common SPF Record Errors and Fixes

Common SPF Record Errors and Fixes

Email is amazing. Until it breaks.

And one tiny DNS typo can silently wreck your email delivery. That tiny typo often lives inside your SPF record.

SPF sounds technical. And yes, it is. But don’t worry. We’ll keep this simple, practical, and maybe even a little fun.

TL;DR: SPF records tell the world which servers can send email for your domain. Small mistakes like too many lookups, missing includes, or syntax errors can cause major delivery problems. Most SPF issues are easy to fix once you know what to look for. Keep it clean, keep it under 10 lookups, and always test after changes.

What Is an SPF Record (In Plain English)?

SPF stands for Sender Policy Framework.

It’s a DNS text record. It tells receiving mail servers: “These servers are allowed to send email for me.”

If your SPF is wrong?

  • Your emails go to spam.
  • Your marketing campaigns fail.
  • Your invoices never arrive.
  • Your boss gets nervous.

So yes. It matters.

Common SPF Errors (And How to Fix Them)

1. Too Many DNS Lookups

This is the most common SPF problem.

SPF allows a maximum of 10 DNS lookups.

Each of these counts as one lookup:

  • include:
  • a
  • mx
  • exists:
  • redirect=

If you go over 10? SPF fails. Completely.

Example of a problem:

v=spf1 include:_spf.google.com include:mailgun.org include:sendgrid.net include:amazonses.com include:hubspot.com -all

Looks harmless. But each include may trigger more lookups behind the scenes.

Fix:

  • Remove services you no longer use.
  • Combine services carefully.
  • Ask providers for optimized SPF includes.
  • Use SPF flattening tools (carefully).

Keep your lookup count under 10. Always test after changes.

2. Multiple SPF Records

You should have only ONE SPF record per domain.

This is wrong:

v=spf1 include:_spf.google.com -all
v=spf1 include:mailgun.org -all

When multiple records exist, receiving servers may return:

PermError

Which basically means… failure.

Fix:

Merge everything into a single record.

Correct version:

v=spf1 include:_spf.google.com include:mailgun.org -all

Simple rule: One domain. One SPF. One TXT record.

3. Missing “v=spf1” at the Beginning

Every SPF record must begin with:

v=spf1

If it doesn’t? It’s not SPF.

Wrong:

include:_spf.google.com -all

Correct:

v=spf1 include:_spf.google.com -all

This one is easy to fix. But surprisingly common.

4. Using +all (The Dangerous Mistake)

If you see this:

v=spf1 +all

Stop immediately.

+all means: “Everyone can send email for my domain.”

That includes scammers.

That includes attackers.

That includes anyone on the internet.

This defeats the entire purpose of SPF.

Fix:

  • Use -all for strict enforcement.
  • Or ~all for soft fail during testing.

Most mature setups should use:

-all

5. Missing Include for a New Email Service

Started using a new email tool?

  • Mailchimp
  • SendGrid
  • Zendesk
  • Salesforce

If you don’t update SPF, emails from that service may fail authentication.

Symptoms:

  • Emails land in spam.
  • SPF shows “fail” in message headers.

Fix:

Add the correct include: statement from your provider’s documentation.

Always verify the include is official. Never copy from random blogs.

6. Exceeding the 255 Character Limit (TXT Record Splitting Issues)

DNS TXT records have length limits.

If your SPF is too long, your DNS provider may split it incorrectly.

This breaks validation.

Fix:

  • Check how your DNS provider handles long TXT records.
  • Ensure the record remains logically one continuous SPF string.
  • Reduce includes if needed.

Cleaner SPF = fewer problems.

7. Incorrect IP Address Syntax

Adding a sending server manually?

Correct format:

ip4:192.168.1.1

Common mistakes:

  • Missing ip4:
  • Typos in IP address
  • Using private IP ranges publicly

Always double-check with your hosting provider.

8. Wrong Use of ~all, -all, and ?all

This small piece at the end matters a lot.

  • -all = Hard fail
  • ~all = Soft fail
  • ?all = Neutral
  • +all = Allow all (bad)

Best practice?

  • Start with ~all if unsure.
  • Move to -all once confident.

Do not leave it as neutral forever. That weakens protection.

How to Check If Your SPF Record Is Broken

Use testing tools. Always test.

Popular SPF Testing Tools

Tool What It Does Beginner Friendly Lookup Counter
MXToolbox SPF validation and DNS diagnostics Yes Yes
EasyDMARC SPF, DKIM, DMARC checker Very Yes
Kitterman SPF Validator Deep technical SPF validation Medium Yes
DMARC Analyzer Full authentication analysis Yes Yes

What you’re looking for:

  • No PermError
  • No too-many-lookups warning
  • Valid SPF syntax
  • Pass result in test emails

Real World Example: Before and After

Broken SPF:

v=spf1 include:_spf.google.com
v=spf1 include:mailgun.org

Problem:

  • Two SPF records
  • Causes PermError

Fixed SPF:

v=spf1 include:_spf.google.com include:mailgun.org -all

Now:

  • Single record
  • Clear fail policy
  • Cleaner authentication

Advanced Problem: SPF Flattening

If you hit the 10 lookup limit, you may hear about SPF flattening.

This replaces include statements with actual IP addresses.

Sounds smart. And it can work.

But beware:

  • If your provider changes IP addresses, your SPF becomes outdated.
  • You must maintain it regularly.

This is helpful for complex setups. But not always necessary.

SPF Troubleshooting Checklist

If emails are failing, go through this list:

  • ✅ Do I have exactly one SPF record?
  • ✅ Does it start with v=spf1?
  • ✅ Am I under 10 DNS lookups?
  • ✅ Am I using -all or ~all?
  • ✅ Did I include all sending services?
  • ✅ Did I test with an SPF validation tool?

This checklist solves 90% of problems.

Bonus Tip: SPF Alone Is Not Enough

Modern email authentication includes:

  • SPF
  • DKIM
  • DMARC

SPF checks who can send.

DKIM verifies message integrity.

DMARC tells receivers what to do if checks fail.

They work best together.

Why SPF Errors Hurt More Than Ever

Email providers are stricter now.

  • Google enforces strong authentication.
  • Microsoft filters aggressively.
  • Yahoo rejects suspicious mail faster.

A small SPF mistake in 2026 can mean:

  • Campaign failure
  • Lost revenue
  • Support tickets
  • Reputation damage

The good news?

SPF is simple once cleaned up.

Final Thoughts

SPF records are not scary.

They’re just picky.

Most errors come from:

  • Adding too many services
  • Forgetting old ones
  • Copy-pasting without testing

Keep your SPF:

  • Short
  • Clean
  • Under 10 lookups
  • Properly tested

And remember.

Email delivery is not magic.

It’s configuration.

And now you know how to fix it.

Clean SPF. Happy inbox.

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Khera

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