HEY - Email at its best, new from Basecamp.

Vaultastic - Vaultastic - Simplify Data Protection and Management. Flexibility to do more, cover more risks, and optimize costs.

InstAddr - Disposable email address application.

MailBakup - Mailbakup is an all-in-one IT solution that provides an in-demand set of e-mail backup solution to save valuable data from the web-based email account to location derive easily and quickly.

Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.

MailArchiva - MailArchiva is an email archiving, email compliance, and e-Discovery enterprise server.