Sunday, August 30, 2020

DKIM - DomainKeys Identified Mail

DKIM or DomainKeys Identified Mail is a security measurement to check if an email is sent from authorized or unauthorized sender.

It adds a digital signature to every message sent. This allows the receiving server can verify if the message is forged.

A sender can pretend the message is sent from, for example. You might see the sender email is, but actually it is sent from malicious source. Checking the DKIM, will reveal if this email is indeed sent from a specific domain, that is authorized by the domain's owner.

2 other terms related to DKIM are SPF (Sender Policy Framework) and DMARC (Domain-based Message Authentication, Reporting, and Conformance).

Further reads:

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