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;
- 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.