What UI features do you consider important? I feel that email UI is largely standardized, and the main differentiating factor is speed (and Gmail is definitely not fast).
OTOH, what Gmail does with filtering promotional crap (spam, tbh) is decent, but I haven't compared against other mail service providers, so I can't give a comparative opinion.
OTOH, what Gmail does with filtering promotional crap (spam, tbh) is decent, but I haven't compared against other mail service providers, so I can't give a comparative opinion.