SPF Checker: Validate Your SPF Record and Fix SPF Errors
Check your SPF record, verify authorized sending servers, validate SPF syntax, and detect configuration issues affecting email deliverability.
Results
- Free SPF lookup
- Instant results
- No signup required
What does this SPF checker analyze?
Run a complete SPF lookup and get a clear diagnosis of your DNS record, configuration issues, and deliverability impact.
SPF record lookup
Retrieve the SPF TXT record currently published in your DNS.
SPF syntax validation
Ensure your record follows SPF formatting and rules.
Authorized sending servers
Identify which IPs and services can send emails for your domain.
DNS lookup limit check
Detect if your SPF exceeds the 10 DNS lookup limit.
SPF errors and warnings
Find duplicate records, invalid mechanisms, and missing policies.
Deliverability impact
How SPF affects authentication, spoofing protection & inbox placement.
SPF Record Examples
Here are common SPF examples used across popular email setups.
Google Workspace
v=spf1 include:_spf.google.com ~all
Microsoft 365
v=spf1 include:spf.protection.outlook.com ~all
Mailgun
v=spf1 include:mailgun.org ~all
Custom sender IP
v=spf1 ip4:203.0.113.5 ~all
Multiple senders
v=spf1 include:_spf.google.com include:mailgun.org ~all
Strict policy
v=spf1 include:_spf.google.com -all
How SPF Works and Why It Matters
SPF (Sender Policy Framework) is a DNS TXT record that defines which servers are allowed to send emails for your domain.
When an email is received, the server checks your SPF record and compares the sending source against your policy. If the sender is authorized, SPF passes. If not, it may fail and increase spam or rejection risk.
A valid SPF record improves authentication, reduces spoofing, and supports DMARC enforcement. While SPF alone is not enough, it is a core foundation of email deliverability.
SPF records start with:
Example:
mailX Related Email Authentication Tools
Check, validate, and generate SPF, DKIM, and DMARC records to improve email deliverability and protect your domain.
Common SPF Errors This Tool Detects
No SPF record found
Your domain has no SPF configuration.
Multiple SPF records
Only one SPF record should exist.
Invalid SPF syntax
Errors in formatting or mechanisms.
Too many DNS lookups
More than 10 lookups → SPF fails.
Overly permissive record
Too broad = weak protection.
Missing policy
No ~all or -all defined.
SPF, Email Authentication & Deliverability Guides
How To Fix SPF Errors
SPF errors occur when your domain's SPF record is misconfigured, exceeds the 10 DNS lookup limit, or contains syntax issues.
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Free SPF Checker to Validate Your SPF Record
Use this SPF checker to perform an SPF lookup, validate your Sender Policy Framework record, and detect SPF errors that may impact email deliverability.
An SPF record is a DNS TXT record that tells receiving mail servers which IP addresses and platforms are allowed to send emails on behalf of your domain. If your SPF record is missing, invalid, or misconfigured, your emails are more likely to fail authentication checks or land in spam.
This tool helps you check SPF syntax, confirm your authorized sending servers, and identify configuration issues before they affect your deliverability.
SPF Record Check Results
Status & Record
SPF status (valid / missing / error) & Full SPF record
Analysis Summary
Syntax validity, Authorized senders & DNS lookup count
Issues & Fixes
Detected problems & Recommended fixes
Fix Your Deliverability with an Expert
Get a personalized audit of your SPF, DKIM, and email setup. Identify what’s hurting your deliverability and get clear, actionable fixes in a 30-minute session.