SPF Record Checker
This SPF Record Checker validates Sender Policy Framework configuration, detects DNS lookup limits, and identifies email spoofing risks in real time.
About This Tool
The SPF Record Checker analyzes Sender Policy Framework (SPF) TXT records used to authorize email servers for a domain.
SPF helps prevent email spoofing and improves deliverability by defining which mail servers are allowed to send emails on behalf of your domain.
You can use this tool to:
- Validate SPF syntax
- Detect risky +all configurations
- Check DNS lookup count (10 lookup limit)
- Identify included domains and IP mechanisms
- Improve email deliverability setup
This tool performs live DNS queries and does not store domain data.
Frequently Asked Questions
What is an SPF record?
An SPF (Sender Policy Framework) record is a TXT DNS record that specifies which mail servers are authorized to send email on behalf of your domain. It helps prevent email spoofing and phishing attacks.
How do I know if my SPF record is valid?
A valid SPF record:
Starts with v=spf1
Includes authorized mechanisms like ip4, ip6, include, or a
Ends with a policy such as -all, ~all, or +all
Your SPF record should ideally end with -all for strict enforcement.
What does “-all” mean in SPF?
The -all mechanism means:
Only the listed servers are allowed to send email. All others should be rejected.
This is the most secure SPF configuration.
What is the SPF 10 DNS lookup limit?
SPF allows a maximum of 10 DNS lookups.
If your SPF record exceeds this limit:
Email delivery may fail
SPF validation may break
Messages may be marked as spam
What is the difference between ~all and -all?
~all → SoftFail (less strict, monitoring mode)-all → HardFail (recommended for full protection)
Can I have multiple SPF records?
No. A domain must have only one SPF record.
Multiple SPF records will cause validation errors.
Why is my SPF record important for email deliverability?
Without SPF:
Emails may be flagged as spam
Spoofing risks increase
Your domain reputation may decline
SPF improves trust and authentication.
