sender

happy, mean, single, unknown

The email came from an unknown sender, so I deleted it without reading it.

addresses, decoding, displayed, names, paid, return

The email displayed the sender's name and address at the top of the message.

addressee, classmate, recipient, recipients, s

The sender and recipient agreed to meet at the coffee shop after work.

from

The email was returned to the sender from the mail server due to an incorrect address.

really

The email sender really didn't include enough detail for us to understand the full request.