Courier-IMAP
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Courier-IMAP is software to provide an imap service, i.e. a daemon.
Installation
Install it as described under installing software. Start the imap daemon like this:
/etc/init.d/courier-imap start
Verify that it is running like this:
lvps87-230-12-146:/etc # nmap localhost | grep 143 143/tcp open imap
Configure the daemon via /etc/courier-imap/imapd. The only change I did was
AUTHMODULES="authpwd"
This line has the effect that /etc/passwd is used to authenticate the imap users.
TroubleShooting
login to server failed
If you get the error message "login to server failed", it is probably because your authentication daemon is not running. So, start it and restart courier
/etc/init.d/saslauthd restart /etc/init.d/courier-imap restart