Mail
Internet Mail is the most used mail protocol on the Internet. It includes sending mail, retrieving mail, and formatting the messages.
Message format
The format of Internet Mail messages has been rigidly defined in RFCs and Internet drafts.
Simple Mail Transfer Protocol (SMTP)
SMTP is used for sending mail between client and server and between servers.
[>] ISDMail
The IDSMail OLE Server allows software developers to incorporate E-mail send and receive capability into their applications. It supports SMTP, POP, and MAPI, and it can auto-sense the E-mail system installed.