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/usr/share/doc/courier-imap/README.Debian is in courier-imap 4.10.0-20120615-1ubuntu7.

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Debian Packaging Issues
***********************

Please read /usr/share/doc/courier-base/README.Debian for more
information about the packaging of the Courier Mail Server suite.

Default Settings 
****************

The default value for maximum number of connections from the same
IP address (MAXPERIP in /etc/courier/imapd) has been raised to 20. 
This helps to avoid mysterious errors with current IMAP clients
(e.g., saving sent mails into the Sent folder fails). 
For example, Mozilla Thunderbird uses 5 connections by default.