Which is the best email service provider you can think of?

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I have email in yahoo, and gmail. But now , rediff is offering unlimited, and gmail is supposed to be the most secure. Which is the best, hotmail or rediff or yahoo or gmail? Rank it in terms of 1.Security 2.reliablity ( I don't want it to vanish offf, one fine morning...I want my mails to be with me forever) 3.Fast and ease of use. Thsnk you for responding. yours friendly Heartwalker