cyrus-common-2.2 2.2.13p1-15 (amd64 binary) in ubuntu precise

 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;
  - POP/IMAP-before-SMTP using DRAC;
  - secure IMAP using SSL;
  - server-side filtering with Sieve;
  - mail users without login accounts;
  - simple mail quotas;
  - virtual domains;
  - IPv6.
 .
 Cyrus doesn't support reading from and storing mail in the
 standard mail spool. It stores mail in a separate directory in its
 own MH-like format.
 .
 This package contains the common files needed by the other Cyrus
 components. The cyrus22-imapd and/or cyrus22-pop3d packages are needed
 to enable IMAP and POP3 support respectively. cyrus22-murder can be
 used to enable IMAP, POP3, and LMTP proxying.