There are a list of mail providers .every one has a spl features .
I cant pretend that any of them good or best because every second email service providers are upgrading themselves and implement new things on their mail servers . for the basis of that i rate the as
1> gmail : free ,fast,Huge mail server ,with dynamic mail space,and good filtering option .
In gmail "vacation auto response " is available . and pop3 support is available whis makes it the best free e-mail client.one more thing which attracts me in gmail is "Autosave" function ..
but the main demerit i found in gmail is it is not i candy(looks).
LOOKS MATTER .
2> new Yahoomail .
Cool i candy looks . free . easy to use .
BUT NO pop3 or IMAP support .
and also resource hungry interface which required higher bandwidth.
3>hotmail
first e mail client ..
But Premier version is cool .
free version is i candy . but need broadband connection to open .
Otherwise you will get problem