SMTP





Summary

This chapter tells you how to create network programs that handle network mail. Most network mail systems divide the mail function into three parts: the Mail Transfer Agent (MTA) delivers messages to local and remote users using the Simple Mail Transfer Protocol (SMTP). The Mail Delivery Agent (MDA) delivers mail to local users but contains special functions such as mail filtering. The Mail User Agent (MUA) allows remote users to read messages in their mailboxes.

Windows 2000 and XP platforms contain the Collaborative Data Object (CDO) library, which can be used by programs to deliver mail using SMTP, as well as other network mail and news functions. The .NET mail library utilizes CDO to support the System.Web.Mail mail functions. Windows 2000 and XP platforms also allow customers to install the Internet Information Server (IIS) package, which includes an internal SMTP mail server that can forward and receive messages from the CDO library.

The SmtpMail class is used for sending e-mail messages using either the internal SMTP server, or an external mail relay server. Messages can be created using the MailMessage class to include fancy formatting of text and special mail headers. The MailAttachment class is used to include binary attachments to mail messages sent by the SmtpMail class. This allows the network program to create full-featured mail programs with minimal effort.

Also covered in this chapter is the Post Office Protocol (POP3) and how to construct a simple POP3 mail client program to retrieve messages from a remote mail server.

Next to e-mail, the World Wide Web (WWW) is possibly the most influential application used on the Internet. It is no surprise that the .NET library contains many classes that support web programming. The next chapter discusses the many classes used for web programming in C#


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