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Gumnu is a mail client for low bandwith (WAP enabled) mobile devices written in PHP. It has a framework for separating the (WML,HTML) interface from the rest of the project. It uses gettext for i18n, IMAP/SMTP provided by php, MySQL for settings.
A web-based bandwith efficient mail client written in Perl. It is intended for people
who are travelling but it can also be used as a regular mail reader if you want more
control on your mail server.