In the realm of email security, “message repudiation” refers to what concept?

A.
A user can validate which mail server or servers a message was passed through.

B.
A user can claim damages for a mail message that damaged their reputation.

C.
A recipient can be sure that a message was sent from a particular person.

D.
A recipient can be sure that a message was sent from a certain host.

E.
A sender can claim they did not actually send a particular message.