Windows eml and mbox viewer.
The Next Generation Mail Transport Class.
Free Email Backup Software | Email Backup App for Android
Web and API based SMTP testing
A program to send mail via SMTP from command line
Converts quoted-printable, UTF-8, UTF-16BE, UTF16LE to 8-bit.
Free and open source webmail software
javascript to convert thunderbird/seamonkey filters to sieve rules
Email client based on the Eclipse RCP platform.