Right now, only downloading single emails. This is an area I’d really like to improve on though. The single best option, and what I’ll be working on as soon as I’m done with mailing lists, is supporting IMAP. That will let you import/export mail directly, and give support for a bunch of third party clients. Unfortunately, because Port87 is very different than other email services, I’m going to have to write my own IMAP server. I have the spec printed out in a binder in my office, so I’ll be getting started on it pretty soon. That’s a big big project though, so realistically, it’ll probably be over a year, maybe two, before Port87 supports it.