What is an Email Spoofing Checker?
It's an analysis tool that reads an email's hidden metadata (the "header") to verify if it was truly sent from the person and domain it claims to be from. It does this by checking three key security standards: SPF, DKIM, and DMARC.
Decoding the Digital Fingerprint
When an email is sent, receiving servers (like Gmail) perform authentication checks and record the results in the header. Our Spoofing Checker doesn't send any emails or perform lookups itself; instead, it acts as a powerful interpreter. You paste the raw header, and our tool parses the complex data to find the `Authentication-Results` line.
It extracts the status for SPF (was the server authorized?), DKIM (was the message tampered with?), and DMARC (what should happen if checks fail?), and presents them in a clean, color-coded, and easy-to-understand format. This process happens entirely in your browser, so the contents of your email header are never sent to our servers.
Why Choose Our Spoofing Checker?
Simple & Educational
We turn technical header information into simple Pass/Fail results with clear explanations, helping you learn about email security.
100% Private and Secure
Your email headers are processed directly in your browser and are never uploaded, ensuring the content of your emails remains confidential.
Instant Analysis
Get immediate results as soon as you paste the header. No waiting, no sign-ups, no lengthy process.
Completely Free to Use
Analyze as many email headers as you need to stay safe from phishing, completely free.
Analyze Sender Security
Verify if an email sender is genuine by checking SPF, DKIM, and DMARC records. Detect spoofing and protect yourself from phishing.
Check Email Sender Security
How to Check a Suspicious Email
Follow these steps to find and analyze an email's header to verify its authenticity.
Find and Copy the Email Header
In your email client, open the suspicious email. Find the option to "Show Original" or "View Message Source".
- **Gmail:** Click the three dots (⋮) next to Reply, then "Show original".
- **Outlook:** Click the three dots (⋯) in the message pane, then go to View > View message details.
Copy the entire block of text that appears.
Paste and Analyze
Return to this tool and paste the entire copied header into the large text box. Then, click the "Check Header" button to begin the analysis.
Review the Results
The tool will display the results for SPF, DKIM, and DMARC. A "PASS" status for all three is a strong indicator that the email is legitimate. Any "FAIL" is a major red flag for a spoofed or phishing email.
Quick Tips for Spotting Phishing
Trust Fails, Not Passes
A "FAIL" on SPF or DKIM is a very strong signal the email is fake. A "PASS" is a good sign, but you should still be cautious of the email's content.
Check the 'From' Domain
Phishers often use look-alike domains (e.g., `g00gle.com` instead of `google.com`). Always double-check the sender's domain name, not just the display name.
Hover Over Links
Before clicking any link in a suspicious email, hover your mouse over it to see the actual destination URL. Make sure it matches where you expect to go.
Understanding the Input & Output
Learn what an email header is and what the SPF, DKIM, and DMARC results mean for your security.
Input: Full Email Header
What is it? Think of the email header as the digital envelope and all the postmarks on a physical letter. It contains technical metadata about the email, including which servers it traveled through, timestamps, and—most importantly—the results of the security checks performed by your email provider.
Why is it required? The "From" address you see in your inbox can be easily faked. The header is the **source of truth**. It contains the `Authentication-Results` field where servers like Gmail and Outlook record whether the email passed or failed crucial anti-spoofing checks. Our tool reads these results to give you an accurate verdict.
Input: Sender's Email Address (Optional)
What is it? This is the "From" address that is displayed in your inbox.
Why is it optional? Because this address can be easily forged, it is not used for the primary security analysis. However, providing it can be a useful cross-reference. You can use it to quickly check if the domain in the "From" address matches the domains that were verified by the SPF and DKIM checks.
Output: SPF (Sender Policy Framework)
What is it? An email authentication method that acts like a public list of approved mail carriers. The owner of a domain (e.g., `google.com`) publishes a list of all the servers that are authorized to send email on their behalf.
Why is it important? When your inbox receives an email, it checks the sender's IP address against this public list. A **PASS** means the server is authorized. A **FAIL** means an unauthorized server sent the email, which is a strong sign of spoofing.
Output: DKIM (DomainKeys Identified Mail)
What is it? This method acts like a tamper-proof digital seal on the email. The sending server attaches a unique, encrypted signature to the message.
Why is it important? Your email provider uses a public key from the sender's domain to verify this signature. A **PASS** proves two things: the email genuinely came from the claimed domain, and its content was not altered in transit. A **FAIL** means the seal is broken, which is a major red flag for phishing.
Output: DMARC (Domain-based Message Authentication, Reporting & Conformance)
What is it? DMARC is the policy that ties SPF and DKIM together. It's a set of instructions from the domain owner that tells receiving servers what to do if an email fails the SPF and/or DKIM checks.
Why is it important? It's the enforcement arm of email security. A DMARC policy can tell your inbox to quarantine (send to spam) or reject (block entirely) an email that fails authentication. A **PASS** means the email met the sender's security policy. A **FAIL** means it's a confirmed forgery according to the domain owner's own rules.
Received a Suspicious Email?
Don't be a victim of phishing. Use our free tool to analyze its header and check its authenticity before you click.
Spoofing Checker Applications
Analyzing email headers is a fundamental skill for personal security and professional IT roles.
Personal Phishing Detection
Received an urgent email from your "bank" or "PayPal"? Before clicking anything, paste its header here. A failed SPF or DKIM check is a clear sign that it's a fake and should be deleted immediately.
Corporate Security Training
IT departments can use this tool to train employees on how to spot phishing. By showing them the clear "PASS" or "FAIL" results from real examples, it makes the abstract concept of email authentication tangible.
Troubleshooting Email Delivery
System administrators can use this tool to debug why their own company's emails might be failing authentication checks. It provides a quick and easy way to see the SPF and DKIM results as seen by receiving mail servers.
Who Can Benefit?
Everyday Email Users
Anyone who wants a quick second opinion on a suspicious email before they trust its contents.
Business Professionals
A crucial tool for verifying the authenticity of financial requests, invoices, and other important business communications.
IT & Security Teams
A fast, client-side tool for initial triage of reported phishing emails and for educational purposes.
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Frequently Asked Questions
Get instant answers to common questions about our Email Spoofing Checker.
Do you see or store my email headers?
Never. The entire analysis process happens locally in your web browser. The header you paste is never sent to our server or any third party. Your privacy is 100% protected.
If all checks pass, is the email guaranteed to be safe?
No. Passing SPF, DKIM, and DMARC is a very strong sign that the email came from the legitimate domain it claims. However, phishers can still send malicious links or attachments from a legitimate (but compromised) email account. Always remain cautious and inspect the email's content.
What does "softfail" or "neutral" mean?
These are intermediate results. A **softfail** means the domain owner thinks the sending server is probably not legitimate but isn't 100% sure. A **neutral** result means the domain owner explicitly states they cannot or will not vouch for the sender. You should treat both of these results with suspicion.
What if I can't find any SPF, DKIM, or DMARC results in the header?
This could mean the receiving email server didn't perform these checks, or the sending domain has not set up these security policies. In either case, it means the email's authenticity cannot be verified, and you should consider it highly suspicious.
Need Help or Have Questions?
Our support team is ready to assist you with any questions or technical issues.
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