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SPF Missing 'all' Mechanism

Your domain has an SPF record but it's missing the critical all mechanism at the end. Without it, unauthorized senders default to a neutral result, providing no protection.

On this page

  1. What "no all mechanism" means
  2. Why every SPF record needs all
  3. How this happens
  4. How to fix it
  5. Before and after examples

What "no all mechanism" means

An SPF record is evaluated from left to right. Each mechanism (include, ip4, mx, etc.) is checked against the sender's IP address. If a match is found, the corresponding result is returned. But what happens when no mechanism matches?

That's where the all mechanism comes in. It acts as a catch-all at the end of the record, defining the default result for any sender that doesn't match any of the listed mechanisms.

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Without an all mechanism: When no mechanism matches and there is no all at the end, SPF returns a "neutral" result. This is the same as ?all — receiving servers make no distinction between authorized and unauthorized senders. Your SPF record is effectively incomplete and provides no protection against spoofing.

Here's a comparison of what a complete versus incomplete SPF record looks like:

Incomplete (missing all)

v=spf1 include:_spf.google.com

This record authorizes Google Workspace, but says nothing about what to do with emails from other servers. Unauthorized senders get a "neutral" result, which means no protection.

Complete (with -all)

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

This record authorizes Google Workspace and explicitly rejects everything else. Unauthorized senders get a "fail" result, which tells receiving servers to reject the email.

Why every SPF record needs all

The all mechanism is the most important part of your SPF record. Without it, your authorized sender list is only half the equation. You've said who is allowed, but you haven't said what to do about everyone else.

SPF record ending Unauthorized sender result Protection
-all Fail — email rejected Strong (recommended)
~all Softfail — email flagged as suspicious Moderate
?all Neutral — no action taken None
No all mechanism Neutral — no action taken (implicit default) None

As you can see, a missing all mechanism produces the same result as ?all: no protection. The only difference is that ?all is an explicit choice, while a missing all is almost always an oversight.

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Think of it like a security checkpoint: Your SPF mechanisms define who gets through the checkpoint. The all mechanism is the instruction for what to do with everyone who isn't on the list. Without it, the default is to let them through unchecked.

How this happens

There are several common reasons an SPF record might be missing the all mechanism:

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Typo or copy error

When copying an SPF record from documentation, the -all at the end was accidentally left out or truncated.

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Incomplete setup

The record was created as a work-in-progress and never finished. The administrator may have intended to add -all after testing but forgot.

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Editing mistake

When modifying the record to add a new service, the -all was accidentally removed or the new text was added after it instead of before it.

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Misunderstanding

The administrator may not have realized that the all mechanism is required for SPF to provide any enforcement against unauthorized senders.

How to fix it

The fix is straightforward: add -all to the end of your existing SPF record.

1

Review your current SPF record

Look at your existing SPF record and make sure all your legitimate email senders are listed. Since you already have an SPF record with authorized senders, you likely just need to add the missing -all at the end.

2

Verify all senders are included

Before adding -all, double-check that every service that sends email from your domain is listed in the record. This includes your email provider, marketing platforms, CRM, helpdesk, and any custom applications. Adding -all will block email from any sender not in the record.

3

Add -all to the end of your record

Log into your DNS provider's control panel, find your SPF TXT record, and add -all at the very end, after all other mechanisms. Make sure there's a space before it.

4

Save and verify

Save the DNS record change and verify it using Domain Guarddog or a command-line tool like dig TXT yourdomain.com. Allow up to 48 hours for full DNS propagation.

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Unsure about your senders? If you're worried about accidentally blocking legitimate email, you can start with ~all (soft fail) instead of -all. This will flag unauthorized emails as suspicious without rejecting them, giving you time to verify your setup. Once confirmed, switch to -all for full protection.

Before and after examples

Google Workspace

Before (missing all):

v=spf1 include:_spf.google.com

After (with -all):

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

Microsoft 365

Before (missing all):

v=spf1 include:spf.protection.outlook.com

After (with -all):

v=spf1 include:spf.protection.outlook.com -all

Multiple services

Before (missing all):

v=spf1 include:_spf.google.com include:sendgrid.net ip4:203.0.113.10

After (with -all):

v=spf1 include:_spf.google.com include:sendgrid.net ip4:203.0.113.10 -all

IP-based record

Before (missing all):

v=spf1 ip4:192.0.2.0/24 ip4:198.51.100.0/24

After (with -all):

v=spf1 ip4:192.0.2.0/24 ip4:198.51.100.0/24 -all
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Placement matters: The -all mechanism must always be the last item in your SPF record. SPF is evaluated left to right, and anything after all is ignored. Never place include or ip4 mechanisms after -all.

For a comprehensive overview of SPF, including all mechanisms, qualifiers, and common mistakes, see our complete guide to SPF.

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