Two Forward options in e-mail setup? whats the diferance

First one
List all email addresses to forward to, one per line:

Second one

Forward-Only Email

(Forward all email to another address!)

In the first case you will have a normal email account on the servers of Dreamhost, with username/password and stored emails, and in addition to this the emails are also forwarded to one or more other email addresses.

In the second case emails are only forwarded, but not kept on the servers of Dreamhost - there is no username/password associated.

Is the 2nd option a “redirect”, in which no forwarding headers are added to the email header, or a standard forward which DOES add to the headers?