Web, domains and email
DKIM
Abbreviation for DomainKeys Identified Mail
In short and in plain language
DKIM is a method that adds a digital signature to outgoing emails.
The signature comes from the domain of the sender.
The recipient can then check whether the email really comes from that domain. They can also see whether it was changed on the way.
Definition
DomainKeys Identified Mail is a method that adds a digital signature of the sending domain to outgoing emails. The recipient can check whether the email really comes from that domain and was not altered on the way.