Emoze it is the real time e-mail push application. Now all Gmail users can get emails directly to phone via sms alerts and more than that its free. You can set account for another email service provider also.
currently this application supports directly for Gmail,Microsoft outlook and lotus. Although there is application named Gmail for emails retrival but you cant get notification for new email. So for busy people this software gives good service for getting email on the go. Offical site is http://www.emoze.com i have attached file which supports for s60 v1 and v2 other mobile users please get their prespective supported applications from site.