Debugging e-mail-related problems
You will learn most about your mail server by talking to it directly in SMTP through a Telnet session. At the same time, you should be monitoring mail logfiles for any messages that occur while you're performing your tests.
In this recipe, we cover a number of techniques for testing and debugging e-mail systems. We will demonstrate how to test your system's ability to:
Receive e-mail by submitting a message directly over SMTP
Send e-mail by sending a message though the mail command
Authenticate users
We'll also mention the location of mail logs, various ways of sending e-mail, debugging SMTP authentication, and other topics. Read on; this recipe should give you a way to find the solution to your problem.
Getting ready
We will be testing the mailing capabilities of a system located at the mailserver.example.com domain name. Our test will be performed from another machine (the client).
Before starting, make sure that you have the Telnet program installed on the client...
