This FAQ is designed to answer common questions about sending e-mail from MVS.
What are my options for sending e-mail from MVS?
What is SMTP? What is its purpose?
What is SMTP? What is its purpose?
SMTP (Simple Mail Transfer Protocol) is a TCP/IP protocol used in sending and receiving mail. It is Internet's standard host to host mail transport protocol. It is defined by RFC821. Request For Comments (or RFC) documents are the written definitions of the protocols and policies of the Internet.

What is RFC822?
What is MIME and why is it important?
What does a SMTP data stream consist of?
How can I send attachments?
How can I prevent users from pretending to be someone else when they send mail?
How does SMTP-Send insulate me from the various Internet Protocols?
Where can I get more information about the IBM SMTP Server?
Do I have to use the IBM SMTP Server?
My SMTP server doesn't recognize the @ character in my e-mail addresses. How can I send mail?
How can I get my SMTP Server to relay all mail to another SMTP mail server?
How do I prevent spammers from hijacking my IBM SMTP Server?
How can I tell who's sending e-mails?