I would like to suggest the inclusion of a Send Again command. (Outlook has one but I’m not holding that out as a benchmark.)
I don’t need this function very often but when I do it’s very useful. I have four circumstances where I use it.
(1) When I’ve made a mistake in the email address in the original and it wasn’t delivered,
(2) When I forget to include someone in the CC list and have to send them an individual copy,
(3) When I have to send slight variations of the original,
(4) When I have to send a reminder to someone that has not replied to the original post.
Send Again is different to Forward.