Gmail is really interesting. I'm a big free-software fan - I really dislike running non-free stuff on my own computer. Not so much for RMS reasons, but just because I like the freedom to hack on stuff as I see fit, and partly just to support open source (it has given me <i>so</i> much over the years). I've never had that hangup about online services though, even though logically they're not really that different. And indeed, I switched to Gmail several years ago because their anti-spam was (and still is, I think) way better than what I was able to cobble together with Linux.<p>However, every now and then I'm reminded that in giving up some freedom, you pay a price. I would love to try and hack in a feature to Gmail that makes it permanently associate certain From email adddresses with people. For instance, if I write someone and set the From to @dedasys.com, I want future email with that person to always use that address. If I use the @apache.org address, then that should be used in the future, unless I change it. I can't implement this, though, as far as I know.