My favorite font for email and for pretty much all online text is Verdana. I love its simplicity, purity, and well-roundedness. I think it is the best font at our disposal. I find the overused Arial to be little too narrow to be read comfortably. It is good in spreadsheet tables to save space, but not for general use. Times is a pretty font, but one that I prefer only in printed text, like books and magazines. Times is one of those fonts that have a curly letter g, as is a staple of serif fonts. I don’t like reading words on my computer screen with that kind of style. See below for an example of what I mean.
Verdana is one font that looks terrific across the board on all operating systems. No matter what kind of computer you are using, everybody will get the same great-looking text.