Binary package “courier-pop” in ubuntu xenial

Courier mail server - POP3 server

 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.
 This package provide the POP3 daemon for Courier. It only supports email
 stored in the Maildir format.