courier-webadmin binary package in Ubuntu Xenial i386

 The Courier mail transfer agent (MTA) is an integrated mail/groupware
 server based on open commodity protocols, such as ESMTP, IMAP, POP3, LDAP,
 SSL, and HTTP. Courier provides ESMTP, IMAP, POP3, webmail, and mailing list
 services within a single, consistent, framework.
 .
 The web-based administration and configuration tool for the Courier
 mail server is capable of changing the settings of the MTA, IMAP, POP
 and Webmail servers and the LDAP, MySQL and PostgreSQL authentication
 modules. Only the installed parts of the Courier mail server show up
 in the administration frontend.

Source package