DKIM (DomainKeys Identified Mail)
DKIM (DomainKeys Identified Mail) adds a cryptographic signature to outgoing email so receivers can verify it really came from your domain and was not altered.
The signature is checked against a public key published in your DNS. Valid DKIM proves authenticity and integrity; broken or missing DKIM hurts deliverability. Together with SPF and DMARC it forms modern email authentication.
Is your DKIM signature valid?
Check your published DKIM key and make sure your mail arrives signed and untouched. Broken DKIM costs you deliverability. Check it free.
Related terms
SPF (Sender Policy Framework)SPF (Sender Policy Framework) is a DNS TXT record that lists which mail servers are allowed to send email on behalf of your domain.DMARCDMARC is a DNS policy that tells receiving servers what to do with email that fails SPF and DKIM checks, and where to send reports about it.MX RecordAn MX (Mail Exchange) record is a DNS record that tells the internet which mail servers are responsible for receiving email for a domain.
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