Amazon Simple Email Service (Amazon SES) customers can now use 2048-bit DomainKeys Identified Mail (DKIM) keys to enhance their email security. DKIM is an email security standard designed to make sure that an email that claims to have come from a specific domain was indeed authorized by the owner of that domain. It uses public-key cryptography to sign an email with a private key. Recipient servers can then use a public key published to a domain’s DNS to verify that parts of the email have not been modified during the transit.
Source:: Amazon AWS