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A high-performance mail server with IMAP, POP3, NNTP and SIEVE support

The cyrus-imapd package contains the core of the Cyrus IMAP server. It is a scaleable enterprise mail system designed for use from small to large enterprise environments using standards-based internet mail technologies.

A full Cyrus IMAP implementation allows a seamless mail and bulletin board environment to be set up across multiple servers. It differs from other IMAP server implementations in that it is run on "sealed" servers, where users are not normally permitted to log in and have no system account on the server. The mailbox database is stored in parts of the filesystem that are private to the Cyrus IMAP server. All user access to mail is through software using the IMAP, POP3 or KPOP protocols. It also includes support for virtual domains, NNTP, mailbox annotations, and much more. The private mailbox database design gives the server large advantages in efficiency, scalability and administratability. Multiple concurrent read/write connections to the same mailbox are permitted. The server supports access control lists on mailboxes and storage quotas on mailbox hierarchies.

The Cyrus IMAP server supports the IMAP4rev1 protocol described in RFC 3501. IMAP4rev1 has been approved as a proposed standard. It supports any authentication mechanism available from the SASL library, imaps/pop3s/nntps (IMAP/POP3/NNTP encrypted using SSL and TLSv1) can be used for security. The server supports single instance store where possible when an email message is addressed to multiple recipients, SIEVE provides server side email filtering.

Package version:2.3.7


$Id: README,v 1.13 2003/10/22 18:50:01 rjs3 Exp $

This is the Carnegie Mellon University Cyrus IMAP Server.

This distribution is what we are running on our production servers.  

The 2.2, 2.1 and 2.0 releases contains many new features over 1.6.

No further development work will progress on 1.6 so we encourage you
to work with the Cyrus 2.2 code wherever possible.  Version 1.6
has known security


With this rpm, you should usually find backups of your mailboxes.db
in /var/lib/imap/backup/. If you don't have them, for any reason,
you can recreate it like this.

Note: The scripts doesn't care with different hashing schemes of
the mailspool. Adjust as needed!
And please, check the permissions mailboxes.db after creating it.


# stop cyrus-imapd
service cyrus-imapd stop

# backup ex



This is a _very_ 'quick and dirty' install howto.

The following steps should lead you to a running Cyrus IMAP server:

1)  Install on a distribution which is supported by this RPM. Don't install
    on a dirty system, where you have previously installed from source.
2)  Don't install if you have a previous Cyrus IMAPd installation <=2.1.x on


Cyrus IMAP autocreate Inbox patch

NOTE : This patch has been cre


Cyrus IMAP autosievefolder patch

NOTE : This patch has been crea


If you have a lot of groups or very large groups, cyrus-imapd login can become
quite slow due to the



We have also seen skiplist corruption in 


The programs provided here in the contrib directory are taken from
various places on the net. Someti

Browse inside cyrus-imapd-2.3.7-12.el5_7.2.x86_64.rpm

         [DIR]etc/ (8)  65535+ mirrors
2.12 KB2014-11-28HEADER  view  2 mirrors
         [DIR]usr/ (2)  65535+ mirrors
         [DIR]var/ (2)  41013+ mirrors

Download cyrus-imapd-2.3.7-12.el5_7.2.x86_64.rpm

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