The Structured Email (SML) working group will develop standards track specifications for:
- annotating human-readable email content with a machine-readable version, to allow for more reliable and accurate content analysis and processing; and
- recommendations for security and trust mechanisms that should be applied when processing machine-readable content in email messages.

Found on the TUHS mailing list

Description of the various programs involved in sending and receiving e-mail, as of 2012.

Browser-based end-to-end encryption for e-mail.

DavMail is a POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to use any mail/calendar client (e.g. Thunderbird with Lightning or Apple iCal) with an Exchange server, even from the internet or behind a firewall through Outlook Web Access. DavMail now includes an LDAP gateway to Exchange global address book and user personal contacts to allow recipient address completion in mail compose window and full calendar support with attendees free/busy display.

Comparison of the Emacs packages Org and Planner.

spmr, a Scheme replacement for procmail. This mail delivery agent lets you sieve and handle incoming files with the comfort of Scheme sounds interesting.