Icedove

"Icedove is an unbranded Thunderbird mail client suitable for free distribution. It supports different mail accounts (POP, IMAP, Gmail), has an integrated learning Spam filter, and offers easy organization of mails with tagging and virtual folders. Also, more features can be added by installing extensions. " from ​http://packages.debian.org/sid/icedove

Resources

FAQs

Description
How do I configure Thunderbird/Icedove to use May First/People Link email?