In my opinion rediffmail comes on no. 2 slot, because I am also using gmail, as it is mandatory these days if one is using android mobile, but other than gmail, if there is any good service available that is only rediffmail, the reason I am telling this, that apart from mailing service once you open it, you get current news but one can say yahoo also does that, but unlike yahoo this mailing system is very fast and light, it opens fast and you can send emails really fast, in order to open its email you do not need high speed internet connection, it opens in 2g speed also, which is very good for people who uses internet in some village area.
It has their own shopping section also and that shopping section looks not very expensive, so if you like you can go for it, just select your product and buy it.