Measuring SMTP STARTTLS Deployment Quality

SMTP Injection via recipient email addresses

The sad state of SMTP encryption

Bitmask 0.9.1: Automated GPG key handling, IMAP/SMTP local proxies

SMTP/Email inspector- like requestb.in or httpbin.org but for email

Google Lets SMTP Certificate Expire

Combining SMTP and HTTP tar pits to proactively reduce spam (2006) [pdf]

Zimmerman (PGP), Levison (Lavabit), release Secure Email Protocol DIME. DIME is to SMTP as SSH is to Telnet.