Question

what would be redundant if added to the content of an e-mail?

I say purpose of e-mail

Answer 1

I don't think so. The purpose might be stated in the Subject line, but it should also be in the first part of the email.

I'd say it's redundant if you include your own name anywhere in the text of the email. Early writers often feel the needs to say something like this:

Hi, this is Emilie!

But don't!!

Answer 2

the other options are date of e-mail, opening statement, or closing.
my other guess would be closing