python-flask-mail [1] is both out of date and named improperly. python2-flask-mail [2] already exists, unfortunately, and is of negligibly higher quality (and up to date), so I suggest python-flask-mail [1] be merged into python2-flask-mail [2] (or however duplicate packages are normally handled)
[1] https://aur.archlinux.org/packages/python-flask-mail/ [2] https://aur.archlinux.org/packages/python2-flask-mail/
