tools ▸ dkim checker

Is your mailsigned properly?

Enter your domain and DKIM selector — or leave the selector blank and we try the common ones — to see the published key, its type and strength.

Selector (optional)

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dkim checker ▸ explained

What you need
to know.

Find and validate a DKIM public key by selector — or auto-detect common selectors.

Email that passes DKIM

selector

Where the key lives

DKIM keys are published at selector._domainkey.yourdomain. The selector is in the DKIM-Signature header of any email you send.

2048-bit

Key strength

1024-bit RSA keys still work but 2048-bit is now the recommendation from Google and Microsoft.

Revoked keys

An empty p= tag means the key was revoked — mail signed with that selector will fail DKIM.

related ▸ more free tools

Keep going.

SPF Checker Validate your SPF record, count DNS lookups against the limit of 10 and spot errors. Open tool DMARC Checker Inspect your DMARC policy, reporting addresses, alignment and enforcement level. Open tool MX Lookup Find the mail servers for a domain, their priority, IPs and detected provider. Open tool DNS Lookup Check A, AAAA, CNAME, MX, NS, TXT, SOA, CAA and SRV records for any domain. Open tool

All 42 free tools →

faq ▸ before you buy

DKIM Checker — FAQ

What is DKIM?+

DKIM (DomainKeys Identified Mail) adds a cryptographic signature to outgoing mail. Receivers fetch your public key from DNS to verify the message was not altered and really came from your domain.

How do I find my DKIM selector?+

Open the original/raw source of an email you sent and look for the DKIM-Signature header — the s= value is the selector. cPanel uses "default", Google Workspace uses "google".

Is DKIM required in 2026?+

Yes, in practice. Gmail and Yahoo require SPF or DKIM for all senders and both plus DMARC for bulk senders.

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