They are as far as I'm concerned. I'm curious, though, who you do consider to be the market leader? I'm going to have a hard time keeping my composure if you say Hotmail (or "Live" mail), Yahoo, or something similar.
huh. has hn always inlined links? maybe i have never added the http: prefix before...?
Never the less, my original point was that all of these Gmail strengths that you think are very important are obviously not very important to people using Yahoo or their ISP webmail. The idea that everyone uses Gmail and any competitor must compete feature-by-feature is just incorrect.
Gmail only just recently (October 2012) overtook Hotmail.
The great thing is, to respond to the initial comment: It's build on top of MailGun, so all the nitty gritty "details" are already solved. It's a great service, really.