With this alternative to your usual Windows Phone Pocket Outlook, you can connect to IMAP and POP email accounts, newsgroups, send email over SMTP and QMail also supports SSL, STARTTLS and S/MIME.
Templates, rules, colours and filters can all be set up as can menu shortcuts, while QMail will also receive RSS content.
All in all QMail is a far more powerful pocket email client than the version of Outlook that ships with Windows Mobile Phones, and is more on par with a desktop email client than a mobile one.