Domain keys are a type of digital signature that can be used to verify the authenticity of an email message. They are typically used to prevent email spoofing, which is when an attacker sends an email that appears to be from a legitimate source but is actually from a malicious source.
There are a few different ways to check the domain key of an email message. One way is to use a DKIM checker tool. These tools are available online and can be used to check the DKIM signature of an email message. Another way to check the domain key of an email message is to use a mail client that supports DKIM.
