Bitween SRL have released MailX, software to allow your phone to have Push Email support on a standard POP3 ir IMAP account for Series 60. Support for multiple accounts, custom message alerts, secure and in the clear IMAP and 128bit encryption are available. Versions for Series 60 v1 and Series 60 v2 are available, along with a Series 80 version.
MailX Push POP3 & IMAP Email for Series 60 Announced
Some comments on the MainX release can be found at Newswireless.net. Interesting thoughts from Guy Kewney!