Findings:
- Authentication
- Password Authentication Protocol
- User Authentication
- Message Authentication Codes
- Pluggable Authentication Module
- Java Authentication and Authorization Service
- Digest Access Authentication
- mutual authentication
- SMTP
- open SMTP relay
- SMTP AUTH
- Telnet to SMTP Servers
- How to configure Sendmail to use SMTP AUTH in FreeBSD
If you Log in you could create a "SMTP authentication" node. If you don't already have an account, you can register here.