POP3 sucks. IMAP rules.
Well, rules enough. In comparison. I still preferred
pineand a shell.
Then GMail came. And I tried it, and it was good. But it was Web and POP3, and POP3 sucks.
I did the web interface for a while, building rules, building folders. The POP interface ignores those rules, ignores those folders, so, in Thunderbird, I had to recreate all the rules and folders I had built in GMail. Which sucks. Beyond, of course, the inherent suckiness of POP.
Now, GMail is offering an IMAP interface.
I don't know if it'll do everything I want it to. Strictly speaking, if I make a DrDobbs folder in GMail and a rule to put the Dr. Dobbs mail in that folder, I want whatever mail interface I have to respect that. So, we'll see.
Of course, nothing beats having Procmail or MH. (I prefer the rules language for MH, but SpamAssassin works with Procmail, so I use Procmail.) But if your mail host disallow executing abstract code triggered by email, then some sorting and IMAP's the next best thing.