DKIM Permerror or DKIM permanent error can be a result of a failed DKIM verification due to missing header fields.

If you know the types of cyber security breaches it becomes easier to take the necessary precautions to protect your organization's data and network.

When was email invented?: The first emails were sent by Ray Tomlinson in 1971. This is where the history of email starts.

A "tailgating attack" is a form of social engineering that emphasizes physical elements over virtual ones.

To read email headers you need to view original messages in your mailbox or use an online tool.

Domain impersonation is when a domain name is used to impersonate another domain name.