Like Alex King before me, I’ve been a happy Fastmail user for quite some time. I like it enough that I heartily recommend Fastmail for your email solution. I’ve used Fastmail since July 2006 and am unlikely to ever look back [presuming they keep their arc of quality service]. Here’s why:

1. I can have access to my email anywhere. Really. They IMAP over SSL, SMTP, and pretty much every other protocol over most any port you’d want to try—including port 80, which is not going to be firewalled by even the most draconian of network situations. If you can touch the Web, you’re gonna have full access to Fastmail. I use OS X’s Mail on all my personal machines, Mobile Mail on my iPhone, and Thunderbird on my work laptop. The experience is seamless.
2. The spam filtering of Fastmail is not only good, it’s actively trainable. I’ve used some AppleScript I cobbled together in 2007 to train Fastmail’s spam filtering: once or twice a day, I make a pass at the junkmail, just to make the system work better for everyone else. For those too lazy to check the link: you can have certain folders set up to learn that stuff is certainly spam in Fastmail. I have a ConfirmedJunk folder that only gets junk in it if I’ve reported it through that AppleScript, which also shoots stuff to spam@uce.gov to help the Feds bust people if they choose. Also, all my archive folders are set to train as non-spam, so if I get a false positive, I just make sure that it gets archived. I find this vastly superior to whitelisting solutions, and frankly, I’m actively helping those who use Fastmail.
3. It’s not Google. I’m not a tin-foil-hat-wearing Luddite, but I don’t want to rely on any one provider for anything. Monocultures are harmful, y’all.
4. Fastmail replicates their data, even though setting that up was a pain in the ass. I’ve actually since had my server die and be saved by replication—and I only knew about it because of the posts on Fastmail’s status weblog.

If you’ve got any other questions about it, I’m happy to answer them. I heartily recommend Fastmail if you care about email as much as I do.

Fastmail rocks. I sing their praises. But the primary datacenter is down for the count this morning, which means they’re offline despite the fact that FM’s failover and replication procedures are excellent. [And honestly, I foresee them addressing the single-point-of-failure datacenter in the future; they're awesome like that.]

So if you need to email me, well, hit me at work or GMail. And if you don’t have either, well, tough for you—not putting those here on the site.

Update, 0747: And we’re back.

Update, 2032: Indeed, now they’re going to work on redundant uplinks, as that was the issue. This is why I spend my money with them.