DKIM Record Checker
Check whether your DKIM TXT record is published and inspect its tags and key data. Key size is estimated; this tool does not verify email signatures.
What is DKIM and why is it essential?
DomainKeys Identified Mail (DKIM) is an open email authentication standard that attaches a digital cryptographic signature to emails. Recipient servers use the sender's public key published in DNS to confirm the message was genuinely sent by the domain owner and was not altered in transit.
Supports Message Authentication
DKIM prevents attackers from spoofing your domain name, ensuring that only your authorized servers can sign outbound emails.
Required by Gmail & Yahoo
Since February 2024, Google and Yahoo enforce strict DKIM and SPF authentication for all bulk senders (>5,000 emails/day).
2048-Bit Recommended
While 1024-bit RSA keys are still supported by most servers, modern security guidelines strongly recommend 2048-bit keys to withstand factoring attacks.
Automate your email deliverability
Mailofly provides REST and SMTP sending, verified domains, official SDKs, and signed webhook events. Free transactional email includes 3,000 emails per month with a 100-email daily limit.