The list of open source email software we can supply or host, install, configure, and support (at the time of writing) is as follows :-

Title	Version	Description	Rating
cgiemail	1.6	The purpose of cgiemail is to take the input of WWW forms and convert it to an e-mail format defined by the author of the WWW form.
FormMail	1.9	FormMail is a generic HTML form to e-mail gateway that parses the results of any form and sends them to the specified users.
NMS::FormMail	3.14c1	NMS::FormMail is a generic HTML form to e-mail gateway that parses the results of any form and sends them to the specified users. It is a drop-in replacement for the older FormMail program.
phpLedMailer	1.8	phpLedMailer is a simple, cool, easy-to-use single-mailing-list application
PHPList	2.10.10 (Stable)  2.11.3 (Development)	PHPlist is a web application that implements a personalised mailing list manager or customer relationship management (CRM) system.
poMMo	PR16.1	poMMo is versatile mass mailing software. It can be used to add a mailing list to your Web site or to organize stand alone mailings.
RoundCube	0.2-stable	RoundCube Webmail is a browser-based multilingual IMAP client with an application-like user interface.
SquirrelMail	1.4.18 (Stable)	SquirrelMail is a standards-based webmail package written in PHP
Z-push	1.2.1	An implementation of Microsoft's ActiveSync protocol which is used 'over-the-air' for multi platform active sync devices.

If there is a title that is missing off this list we might be able to install it for you.