Crystal Mailer has been designed to suit the particular needs of mobile users, rather than imitating desktop e-mail systems. Further, the ability to pre-configure Crystal Mailer with default e-mail settings makes it an ideal messaging choice for large-scale deployment to an end-user or subscriber community.
Crystal Player Ltd. believes that mobile messaging should be focused on providing the best means of communicating, and should offer options beyond simply including a "Reply" feature. Often, the best way for a mobile device user to respond to an e-mailed message is through a phone call, not e-mail. Crystal Mailer supports this principle through tight integration with the Mobile phone Address Book.
Supported messages types:
SMS, E-Mail (SMTP, POP3, IMAP4), Fax, MMS, IrDaDocument, BlueToothDocument, Intellect SMS.
Features
The ability to save attachments in any folder
Grouping of your messages by addressee
SMS chat
Copy and move your messages whenever and wherever you want
Creating your folders in any places
Showing date and time when your messages were added into the subject line
Decoding messages from some non-standart encodings
Lots of settings for mail server synchronization
Internationalization support in SMS chat
Auto email checking by timer

Buy it for $15.95 from Handango
See more information on http://www.crystalmailer.com/