I too normally just forward as well and delete what I don’t want in the email.
There a feature request for a resend at the below thread. Suggest to like / vote for that feature and who knows might be added down the track.
There is a couple of ways though you can do that currently from @Gary post at the bottom of the thread that might help you in the meantime.
(Quote from thread)
Gary
Aug 27
You can select the original message in the sent folder, and choose Forward > Forward as original.
You will need to re-add the recipients.
You can also copy the original sent message to the Local Folder Outbox. Then open it in the Outbox and click Send