Gmail for most of my emails. I have a Yahoo account, for my junk mail, hotmail for Microsoft notifications and Verizon for my personal account.
I have been using Gmail for many years with Mozilla Thunderbird and I can send and receive emails without many problems.
Rick
I USE YAHOO EMAIL, MOSTLY. I ALSO USE GMAIL FOR BUSINESS. I GOT USED TO THE YAHOO/SBC FORMAT. NOW THE EMAIL IS YAHOO/ATT. THEY UPGRADED TO A NEW MAIL FORMAT, IT LOOKS MORE COLORFUL, BUT BOY IS IT A PAIN IN THE BUTT-WHEN YOU GO TO SEND EMAILS TO MORE THAN ONE PERSON. YOU HAVE TO FLIP FLOP BETWEEN THE NEW VERSION AND THE MAIL CLASSIC JUST TO GET YOUR LIST/GROUPS OF CONTACTS (HEAVEN FORBID, IF YOU NEED TO SEND A MESSAGE TO TEN PEOPLE BUT NOT THE ELEVENTH). DOES ANYONE KNOW WHICH EMAIL SERVICE IS THE EASIEST, MOST FRIENDLY- OUT THERE IN CYBERLAND?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic