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.
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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