Some of these
conditions will also result in temporary delivery problems. A normal login failure will result in a
log entry that looks similar to this:
courierpop3login: LOGIN FAILED, ip=[::ffff:1.2.3.4]
In this case, a user from IP 1.2.3.4 entered the wrong username or password.
Several of the other errors that may occur will not be logged to the mail log, which means that you
may have to test them by connecting manually to the POP3 service (from the mail server, or from a
remote machine) and sending a valid username and password. This example shows how to connect
to the POP3 service from a shell prompt on the mail server:
$ telnet localhost 110
Trying 127.0.0.1...
Connected to localhost.localdomain.
Escape character is '^]'.
+OK Hello there.
USER username
+OK Password required.
PASS password
The response you receive from the server should be similar to one of the following:
+OK logged in??”This is a normal response and should mean that there are no problems
with the service.
683
Running a Mail Server 25
-ERR Maildir: No such file or directory??”This error indicates that the user??™s account
does not have a Maildir directory. Use the maildirmake command to create it, as shown
in the section ???Installing Exim and Courier.???
-ERR Maildir: Permission denied??”This error indicates that the user??™s Maildir directory
cannot be read or belongs to the wrong user.
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