Courier Mail Server
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Courier Mail Server, also known as Courier MTA, is a free/open-source message transport agent (MTA) which provides POP3 and IMAP services (among others).
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It is available in standard repositories for the Ubuntu family of Linux distributions (beginning no later than version 8.04).
To get couter-webadmin (the web-based configuration app) to manage hosted domains, it is necessary to create the folder hosteddomains/webadmin inside the existing folder /etc/courier, and give the application write permissions (777 works, but lesser permissions may work as well if the group and/or user are set properly).