mailit is a command line based frontend to any kind of Unix mailer such as sendmail, ssmtp, Postfix, etc. The main benefit is to easily attach text or binary files with properly set MIME types. It is easy to install and use.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.
