a. and b. are actually significantly mitigated by https://pagekite.net/ https://pagekite.net/ , which just happens to be my other project. :-) c. might be OK f

a. and b. are actually significantly mitigated by https://pagekite.net/ https://pagekite.net/ , which just happens to be my other project. :-) c. might be OK for some, but we don't recommend it. Another solution is to run Mailpile in multiple places and teach it to sync multiple instances. Complicated, but might be worth doing.