cyrus-doc 2.5.10-3ubuntu1 (amd64 binary) in ubuntu bionic

 Cyrus is an IMAP server designed to handle massive quantities of mail,
 with a number of features not found in other IMAP implementations,
 including support for:
  - running the daemon without root privileges;
  - POP3 and NNTP in addition to plain IMAP;
  - CalDAV and CardDAV;
  - secure IMAP using SSL;
  - server-side filtering with Sieve;
  - mail users without login accounts;
  - simple mail quotas;
  - virtual domains;
  - IPv6.
 .
 This package contains the documentation for the Cyrus IMAPd suite.
 .
 For more information, please see the cyrus-common package.