Free DKIM Checker Tool – Diagnose & Fix Your Email Authentication
Instantly analyze your domain's DKIM record to find misconfigurations that could be sendingyour emails straight to spam—or worse, letting attackers spoof your domain.
The Input Output of Email Security — Why Deliverability Fails & What It's Costing You
Without the correct inputs — like valid DKIM records — your emails won’t pass authentication checks or reach inboxes reliably. A proper DKIM setup is essential for ensuring email integrity, deliverability, and domain protection.
With Gmail and Yahoo enforcing stronger DKIM requirements by May 2025 — and Microsoft tightening filtering — all major inbox providers now expect full SPF, DKIM, and DMARC configuration. Without it, you’re at risk of delivery issues and domain spoofing.
If you don’t check DKIM or test your records, up to 60% of your emails may land in spam or get blocked. That’s not just a technical issue — it’s lost leads, missed sales, and broken trust with customers.
Misconfigured DKIM selectors, incorrect keys, or missing records cause SPF DKIM DMARC failures. If you haven’t completed DKIM setup for Google Workspace or other platforms, your messages may be silently rejected or exposed to spoofing.
Even small DKIM mistakes can have big consequences. Whether you're sending newsletters, transactional
emails, or client updates, one bad record can ruin your deliverability—and your reputation.
Your legitimate emails get flagged as spam
Your domain becomes vulnerable to spoofing and phishing
Your recipients may stop receiving or trusting your emails
You're losing potential revenue and damaging customer trust
What is a DKIM Record?
A secure inbox starts with DKIM. Here’s everything you need to know.
What is DKIM?
DomainKeys Identified Mail (DKIM) is an email authentication method that adds a digital signature to your
messages. This signature is verified using a public key published in your DNS records.
Why Do DKIM Records Matter?
DKIM helps prevent spoofing, protects your domain reputation, and ensures your emails land in inboxes—
not spam.
Common DKIM Record Mistakes
Missing or malformed DKIM record in DNS - Using outdated or weak cryptographic keys - Misconfigured selectors or domain alignment - Not rotating keys regularly, which
weakens security.
DKIM Selector
A DKIM selector helps identify the location of your DKIM public key in DNS. You can use multiple selectors for different email services.
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Key Rotation
Just like passwords, DKIM keys should be rotated periodically to maintain security.
Check Your EmailStop Email Guesswork — Start with a Real-Time DKIM Check
Misconfigured DKIM, SPF and DMARC don’t just hurt deliverability — they silently block growth and expose your business to serious security risks.
When your email DKIM isn’t setup correctly, it’s not just going to spam — it’s putting your brand and your customers at risk of spoofing and phishing attacks.
Our free DKIM checker shows you exactly what’s broken so you can fix it fast — and stay protected.
"Only 40% of domains have valid DKIM records. The rest are wide open to spoofing and phishing."
– Valimail Email Fraud Report
Fix Email Deliverability Issues: Real Results, Not Just Records
Out iO™ ClickSafe eMail solution provides everything you need to set up, manage, and monitor email authentication — including SPF, DKIM, DMARC, and BIMI — without feeling overwhelmed. You keep full control of your DNS and domain at all times. For DKIM setup and SPF DKIM DMARC configuration, simply point your records to our platform, and we’ll handle record content, updates, and ongoing checks with ease.
Instantly Diagnose DKIM Record Errors
Our scanner reads your DNS record, flags syntax issues, and checks for deprecated or missing fields.
Fix My Email with iO™ ClickSafe eMail
Validate Signature & Selector
Confirms that your DKIM signature matches the public key in DNS and that selectors are correctly configured.
Fix My Email with iO™ ClickSafe eMail
Identify Key Rotation Gaps
Highlights outdated or weak DKIM keys and recommends secure rotation practices.
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Actionable Fixes in Plain English
No more cryptic errors—get human-readable tips to fix your DKIM issues, fast.
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Monitor DKIM Record Health
Optionally manage your DKIM status across multiple domains from a unified dashboard.
Fix My Email with iO™ ClickSafe eMailHow It Works - iO™ ClickSafe Email
Email Expertise That's Broadcast-Worthy
Top media outlets have highlighted our cybersecurity expertise.
FREQUENTLY ASKED QUESTIONS
What does a DKIM record do?
How can I fix an invalid DKIM record?
Can I have multiple DKIM records?
What is a DKIM selector?
How long do DKIM updates take to propagate?
Do I need SPF and DMARC too?
Why is email deliverability so important?
Ready to Fix Your Email?
Don’t leave your deliverability — or your reputation — to chance. Whether you're losing leads to spam folders or risking spoofing attacks, we’ll help you secure your domain and make sure your emails land where they should.
Run a free scan, get expert guidance, and take control of your email authentication with Input Output.
