Free Tool
DKIM Checker
Check whether your DKIM record exists, is valid, and is properly configured. Validate your DKIM selector, review key setup, and strengthen email authentication before deliverability or trust issues affect your domain.
Built for marketers, SaaS teams, agencies, and operators who need to verify DKIM without getting lost in DNS details.
DKIM Record Lookup
Enter your domain and DKIM selector to check whether your DKIM record is present, valid, and supporting a healthier authentication setup.
What it does
What This DKIM Checker Helps You Validate
This DKIM checker helps you review one of the core records in your email authentication setup. It is designed to show whether a DKIM record exists for a given selector, whether it appears valid, and whether there may be issues affecting signature-based authentication.
DKIM Record Presence
Check whether the DKIM record exists for the selector and domain you enter.
Selector Validation
Review whether the selector points to a valid DKIM TXT record in DNS.
Public Key Visibility
Check whether the DKIM public key appears present and correctly published.
Authentication Readiness
Understand whether your DKIM setup is positioned to support email authentication and stronger sender trust.
Why it matters
Why Use a DKIM Checker
DKIM, short for DomainKeys Identified Mail, is one of the main email authentication methods used to verify that an email was authorized by the sender and was not altered in transit.
A weak, missing, or broken DKIM record can reduce trust in your email, create authentication gaps, and contribute to deliverability problems. DKIM also plays an important role in DMARC alignment, so if DKIM is not configured properly, broader domain protection becomes harder to achieve.
Using a DKIM checker helps you validate the record, review the selector setup, and identify issues before they affect inbox placement or authentication performance.
Key benefits
- Check whether a DKIM record exists
- Validate the DKIM selector
- Review whether the public key is published
- Improve visibility into email authentication
- Support stronger domain trust
- Help with DMARC readiness
- Support healthier deliverability conditions over time
Common problems
Common DKIM Problems This Checker Can Reveal
No DKIM Record Found
If no DKIM record exists for the selector, DKIM authentication cannot succeed.
Wrong or Missing Selector
A DKIM selector is required to locate the correct public key in DNS. If the selector is wrong, the lookup fails even if the domain uses DKIM elsewhere.
Syntax or Formatting Problems
A badly formatted DKIM TXT record can make the setup invalid or unreadable.
Missing Public Key
If the p= value is missing or incomplete, the DKIM record cannot be used to validate email signatures.
Outdated or Rotated Keys
DKIM keys can change over time. If DNS and the sending system are out of sync, authentication can fail.
Multiple Sending Sources With Weak Coordination
Different tools may use different selectors. Without a clear setup, DKIM can become hard to manage and troubleshoot.
DKIM Present but Not Enough
A record may technically exist, but that does not automatically mean the domain has a strong, aligned, and fully healthy authentication setup.
Weak Integration With SPF and DMARC
DKIM works best as part of a complete authentication system, not in isolation.
Who it's for
Who Should Use This DKIM Checker
This tool is built for teams that want to understand and validate the signature-based layer of their email authentication setup.
- SaaS teams sending lifecycle and transactional emails
- Marketers using newsletter and automation tools
- Agencies managing client domains and sending setups
- Outbound teams using multiple sending platforms
- Recruiters who rely on stable sender trust
- Operators and technical teams reviewing authentication records
How to check
Enter Your Domain
Paste the sending domain you want to test.
Add the DKIM Selector
Enter the selector used by your sending provider or mail system to publish the DKIM key.
Review the DKIM Result
The tool checks whether the DKIM record exists, whether it appears valid, and whether the public key is available.
Fix and Recheck
If the lookup fails or warnings appear, update the DNS record or selector configuration and run the test again.
Best practices
DKIM Best Practices
Know Which Selector Your Sending Tool Uses
A DKIM record is selector-specific, so the right selector matters just as much as the domain.
Keep Keys and DNS in Sync
If your provider rotates keys or changes selectors, update DNS accordingly and recheck the record.
Use DKIM Together With SPF and DMARC
DKIM is strongest when it supports a broader authentication strategy instead of standing alone.
Document Your Sending Sources
If multiple providers send on behalf of the same domain, each one should be mapped clearly to avoid authentication confusion.
Recheck After Email Stack Changes
Whenever you add a new sending provider, update DNS, or change ESPs, verify the DKIM setup again.
Review Authentication Alignment
A DKIM signature is useful, but it becomes even more valuable when it aligns correctly with the domain visible to recipients.
Do Not Assume DKIM Is Working Just Because It Exists
Presence is not the same as a healthy setup. The selector, key, alignment, and sender configuration all matter.
The bigger picture
DKIM Helps Verify Message Integrity, But It Is Only One Authentication Layer
DKIM helps prove that the message was signed by an authorized sender and that the content was not altered in transit. A stronger authentication setup usually includes:
- SPF
- DKIM
- DMARC
- Domain alignment
- Healthy sender infrastructure
- Ongoing monitoring
Strong DKIM supports
- Stronger authentication trust
- Better alignment with DMARC
- Healthier inbox placement conditions
- Stronger domain credibility
- Less confusion when troubleshooting sender issues
Weak DKIM contributes to
- Failed authentication
- Weaker trust from mailbox providers
- DMARC alignment issues
- Harder troubleshooting
- Slower recovery from deliverability problems
Expert Support
Need More Than a DKIM Record Check?
A DKIM checker helps you validate one important part of email authentication. But if your emails are still landing in spam, inbox placement is inconsistent, or domain trust is weak, the issue may go beyond DKIM alone.
- SPF, DKIM, DMARC, and BIMI
- Sender reputation
- Domain setup
- Inbox placement monitoring
- Blacklist recovery
- Marketing and transactional email deliverability
- Ongoing authentication and infrastructure support
Want an expert review of your email setup?
Talk to a MailAdept expert and get a deliverability audit tailored to your domain and sending environment.
Guides
Learn More About DKIM, Authentication, and Deliverability
If you want to go beyond checking one record, these guides can help you understand how DKIM fits into the broader email system.
Email Authentication
Learn how SPF, DKIM, and DMARC work together to help mailbox providers trust your sending environment.
GuideWhat Is Email Deliverability
Understand how authentication, reputation, infrastructure, and engagement all influence inbox placement.
GuideEmail Automation
See how growing email workflows and multiple sending platforms can affect authentication and deliverability over time.
Tools
Related Email Tools
SPF Checker
Check whether your SPF record exists, is valid, and is authorizing the right senders for your domain.
DMARC Checker
Review whether your DMARC record is published and helping enforce authentication policy.
Blacklist Checker
Check whether your domain or sending IP appears on common blacklist databases.
FAQ
DKIM Checker FAQ
Check Your DKIM Record Before Authentication Problems Hurt Deliverability
Validate your DKIM record, confirm the selector setup, and strengthen the trust signals behind your email before delivery problems become harder to fix.