I am now officially blowing off Mail 5.0. I have tried everything mentioned here with no pop working on my main iMac. Strangely, on the iMac my wife uses pop works just fine, and the settings are identical. I therefore must conclude that there was a glitch in the download of Lion on my iMac, but not on hers. I may be deluded in my concluding, but I will try and download and reinstall Lion once more on my machine.
If that doesn't work I'm going back to Tbird until I see no more complaints about Mail 5.0 on this forum. I'll then come back to mail. At my age I can't afford the aggrevation. BTW, when I set up T'bird a few minutes ago it worked fine first time. You'd think that a huge outfit like Apple, that generates billions o'bucks would be able to program an app like mail, wouldn't you?
BTW, here's a little quiz in species identification nomenclature for anyone who wants to try it: If the plural of mouse is mice, then it must follow that the plural of spouce is spice, N'est-ce pas?