SMTP is the mechanism that allows System i to send out email. It is based on RFC2821 
- "RPG Utility Puts QtmmSendMail API to Work" by David Leland, NEWS/400, September 1998
- Easy/400 MIME & Email
- Make sure the HOST table has an entry for the local machine.
- IBM Infocenter Troubleshooting e-mail (V5R4)