It's also easy to configure a Fastmail account to fetch messages from a Gmail inbox and even send messages via Gmail, for a seamless transition while updating accounts.
Wow, that's a neat feature. I've seen a lot of Fastmail recommendations on HN but none that mentioned this feature. Thanks for bringing it up. I'm probably far from the only person around these parts that wants to migrate off of Gmail but just hasn't made it a priority yet, and this tip certainly helps.