Web, domains and email
DKIM
Abbreviation for DomainKeys Identified Mail
In short and in plain language
DKIM is a method for email. Each email that goes out gets a digital signature from the domain that sends it.
The server that gets the email can then check: does the message come from that domain? Was it changed on the way?
Together with other checks, this can affect whether the emails of a business arrive.
Definition
DKIM is a method that adds a digital signature from the sending domain to outgoing emails. The receiving server can check whether the message comes from that domain and whether it was altered on the way. Together with SPF and DMARC it can influence whether a business's emails are delivered.