What is DKIM?

Make Your Email Airtight With DKIM. A beginner’s guide to what is DKIM and how it helps secure your emails. 

What is DKIM? DKIM, or DomainKeys Identified Mail, is a method of email authentication that allows senders to claim responsibility for their messages. It’s based on public key cryptography, and it works by adding a digital signature to the message header. When the receiver gets an email with DKIM, they check the digital signature to make sure it is valid. If it is, then they know the message has remained unaltered during transfer.