Answers to themselves
Let's say I received an email from friend@f.f and my address is my@m.m. The email appears in the Inbox, and if I click "reply," the new email is filled in with my@m.m as the sender and friend@f.f as the recipient.
Suppose now that I am looking for a reply and so I am in the Sent mail folder. I find my friend's email and would like to write to him again: if I click on reply (in this case I am the sender, not the recipient!) the new email is filled in with my@m.m as the sender and my@m.m as the recipient.
Rather than writing to myself, wouldn't it make more sense for the recipient to be the recipient of the same reply email, i.e. friend@f.f ?
Thank you, Riccardo