What is DKIM?
DomainKeys Identified Mail (DKIM) is an email authentication method that allows the receiver to check that an email was indeed sent and authorized by the owner of that domain. It adds a digital signature to your emails that can be verified using DNS records.
What is a DKIM Selector?
A DKIM selector is simply a name/label for your DKIM key. Think of it like naming a file on your computer.
Common examples:
âĸ default - Most common choice
âĸ mail - Often used by email services
âĸ jan2025 - Include date for key rotation
âĸ newsletter - For specific email types
Why do you need it? It allows you to have multiple DKIM keys for the same domain, and helps identify which key signed which email.