Has been cc d on mail

A common phrase!

"CC'd" is short for "Carbon Copy", which was a common practice in the pre-digital era where a copy of a letter or document was made by placing a sheet of carbon paper between two sheets of paper. When a letter was typed, the carbon paper would transfer the ink from the original to the copy, creating a duplicate.

In modern times, "CC'd" has taken on a new meaning in the context of email. When someone is "CC'd" on an email, it means that their email address is included in the "Carbon Copy" or "CC" field of the email. This means that they will receive a copy of the email, but they are not necessarily the primary recipient or intended recipient of the message.

In other words, when someone is CC'd on an email, it's like they're getting a copy of the letter, but they're not the main person being addressed.