Summary
In this hour, you learned the basics of running an SMTP server using Sendmail. You saw how SMTP is structured, how messages travel from one user to another via SMTP and POP/IMAP, and you saw how to tweak Sendmail to behave according to your personal tastes.
Sendmail is one of the largest and most complex beasts in UNIX. A full treatment of Sendmail-based email services would cover the numerous methods for customizing Sendmail in a large ISP or enterprise configuration. It would also discuss how to set up POP3 and IMAP servers for that “last mile” of the connection, as well as discussing MTAs that are designed as better, faster, more scalable, and easier-to-use alternatives to Sendmail. But what you have seen here is the core of what makes ...
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