Personally I don't really understand the difference between Nokia Messaging and Modest... o.o
The first one pushes the email to the device automatically with some kind of always-on connection and the second one retrieves the messages on certain time lapses/on your demand?
Apart from that? any interface differences? Does only the second one permit to save emails while Nokia Messaging is only a viewer without "reply" option?

Please make it a bit clearer if possible, thanks :-)

I currently use a webmail with free pop3/imap, gmx.com, does it automatically support push email or does it have to be some special mail provider?