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<div class="BodyAfterHead">The Zimbra Collaboration Suite is designed to provide an end-to-end mail solution that is scalable and highly reliable. The messaging architecture is built with well-known open-system technology and standards and is composed of a mail server application and a client interface. </div><div class="Body">The architecture includes the following core advantages:</div><div class="Bulleted1_outer" style="margin-left: 0pt">

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<div class="Bulleted1_inner">'''Open source integrations'''. Linux<span style="vertical-align: super">®</span>, Apache Tomcat, Postfix, MySQL<span style="vertical-align: super">®</span>, OpenLDAP<span style="vertical-align: super">®</span>.</div>
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<div class="Bulleted1_inner">'''Uses industry standard open protocols'''. SMTP, LMTP, SOAP, XML, IMAP, POP.</div>
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<div class="Bulleted1_inner">'''Modern technology design'''. Java, JavaScript thin client, DHTML.</div>
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<div class="Bulleted1_inner">'''Horizontal scalability'''. Because each mailbox server includes its own data store, message store, and set mailbox accounts, you don’t change anything on existing servers in order to scale the system. To scale for additional mail accounts, add more servers.</div>
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<div class="Bulleted1_inner"><span class="Bold">High availability support. </span>Red Hat Cluster Suite is integrated with ZCS, for cluster management.</div>
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<div class="Bulleted1_inner">Browser based client interface.</div>
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<div class="Bulleted1_inner">Administration console to manage accounts and servers.</div>
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The '''data store''' is a MySQL database where internal mailbox IDs are linked with user accounts. The data store maps the mailbox IDs to users’ OpenLDAP accounts. This database contains each user’s set of tag definitions, folders, calendar schedules, and contacts, as well as the status of each mail message - read, unread, tags associated to message, and folder the message resides in.
The '''data store''' is a MySQL database where internal mailbox IDs are linked with user accounts. The data store maps the mailbox IDs to users’ OpenLDAP accounts. This database contains each user’s set of tag definitions, folders, calendar schedules, and contacts, as well as the status of each mail message - read, unread, tags associated to message, and folder the message resides in.

==Core Functionality==

</div><div class="BodyAfterHead">The Zimbra Collaboration Suite provides the following state-of-the-art messaging and collaboration solutions. </div><div class="Bulleted1_outer" style="margin-left: 0pt">

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<div class="Bulleted1_inner">Email messaging</div>
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<div class="Bulleted1_inner">Calendaring</div>
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<div class="Bulleted1_inner">Address Books</div>
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<div class="Bulleted1_inner">Web document authoring</div>
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</div><div class="Body">The core functionality within the Suite is as follows:</div><div class="Bulleted1_outer" style="margin-left: 0pt">

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<div class="Bulleted1_inner">Mail delivery and storage</div>
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</div><div class="Bulleted1_outer" style="margin-left: 0pt">

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<div class="Bulleted1_inner">Indexing of mail messages upon delivery</div>
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<div class="Bulleted1_inner">Backup services</div>
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<div class="Bulleted1_inner">Mailbox server logging</div>
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<div class="Bulleted1_inner">IMAP and POP support</div>
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<div class="Bulleted1_inner">Directory services</div>
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<div class="Bulleted1_inner">Anti-spam protection</div>
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<div class="Bulleted1_inner">Anti-virus protection</div>
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</div><div class="Body">Administrators can easily manage domains, servers, and accounts from the browser based administration console and can manage backup, bulk provision accounts, and perform cross-mailbox searches from the Command Line Utility. (Network Edition)</div><div class="Bulleted1_outer" style="margin-left: 0pt">

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<div class="Bulleted1_inner">Delegate a Domain Administrator (Network Edition)</div>
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<div class="Bulleted1_inner">Move mailboxes from one server to another (Network Edition)</div>
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<div class="Bulleted1_inner">Import Microsoft Exchange user accounts</div>
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<div class="Bulleted1_inner">Add accounts and domains</div>
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<div class="Bulleted1_inner">Set account restrictions either for an individual account or by COS</div>
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<div class="Bulleted1_inner">Manage distribution lists </div>
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<div class="Bulleted1_inner">Set up virtual hosts on a domain</div>
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<div class="Bulleted1_inner">Manage servers</div>
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<div class="Bulleted1_inner">Define policies for moving older messages to secondary storage (Network Edition)</div>
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<div class="Bulleted1_inner">Backup and restore (Network Edition)</div>
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<div class="Bulleted1_inner">Monitor usage</div>
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</div><div class="Body">The Zimbra Web Client mail features include the ability to:</div><div class="Bulleted1_outer" style="margin-left: 0pt">

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<div class="Bulleted1_inner">Compose, read, reply, forward, and use other standard mail features</div>
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<div class="Bulleted1_inner">View mail by conversation threads</div>
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<div class="Bulleted1_inner">Tag mail to easily group messages for quick reference</div>
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<div class="Bulleted1_inner">Use Search Builder to perform advanced searches</div>
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<div class="Bulleted1_inner">Save searches</div>
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<div class="Bulleted1_inner">Use Calendar to schedule appointments</div>
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<div class="Bulleted1_inner">Share calendars with others</div>
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<div class="Bulleted1_inner">Create address books and share with others </div>
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<div class="Bulleted1_inner">Set mailbox usage preferences, including defining mail filtering options</div>
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</div><div class="Bulleted1_outer" style="margin-left: 0pt">

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<div class="Bulleted1_inner">Create, organize and share web documents with Zimbra Documents</div>
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</div><div class="a_0031Heading">

==Zimbra Components==

</div><div class="BodyAfterHead">Zimbra architecture includes open-source integrations using industry standard protocols. The third-party software listed below is bundled with Zimbra software and installed as part of the installation process. These components have been tested and configured to work with the software. </div><div class="Bulleted1_outer" style="margin-left: 0pt">

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<div class="Bulleted1_inner">Apache Tomcat, the web application server that Zimbra software runs in.</div>
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</div><div class="Bulleted1_outer" style="margin-left: 0pt">

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<div class="Bulleted1_inner">Postfix, an open source message transfer agent (MTA) that routes mail messages to the appropriate Zimbra server.</div>
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</div><div class="Bulleted1_outer" style="margin-left: 0pt">

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<div class="Bulleted1_inner">OpenLDAP software, an open source implementation of the Lightweight Directory Access Protocol (LDAP) that provides user authentication.</div>
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</div><div class="Bulleted1_outer" style="margin-left: 0pt">

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<div class="Bulleted1_inner">MySQL database software.</div>
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</div><div class="Bulleted1_outer" style="margin-left: 0pt">

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<div class="Bulleted1_inner">Lucene, an open-source full featured text index and search engine. </div>
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</div><div class="Bulleted1_outer" style="margin-left: 0pt">

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<div class="Bulleted1_inner">Verity<span style="vertical-align: super">®</span>, a third-party source that converts certain attachment file types to HTML.</div>
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</div><div class="Bulleted1_outer" style="margin-left: 0pt">

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<div class="Bulleted1_inner">Anti-virus and anti-spam open source components including:</div>
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<div class="Bulleted2_inner">ClamAV, an anti-virus scanner that protects against malicious files.</div>
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</div><div class="Bulleted2_outer" style="margin-left: 15pt">

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<div class="Bulleted2_inner">SpamAssassin and DSPAM, mail filters that attempt to identify spam.</div>
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</div><div class="Bulleted2_outer" style="margin-left: 15pt">

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<div class="Bulleted2_inner">Amavisd-new, which interfaces between the MTA and one or more content checkers.</div>
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</div><div class="Bulleted1_outer" style="margin-left: 0pt">

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<div class="Bulleted1_inner">James/Sieve filtering, used to create filters for email.</div>
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</div><div class="a_0031Heading">

==System Architecture==

</div><div class="BodyAfterHead">Figure 1 shows the Zimbra Collaboration Suite architectural design, including the open-source software bundled with the Suite and other recommended third-party applications.</div><div class="Body">The Zimbra Collaboration Suite includes the following application packages. </div><div class="a_0032Heading">

===Zimbra Core===

</div><div class="Body">The Zimbra Core package includes the libraries, utilities, monitoring tools, and basic configuration files. </div><div class="a_0032Heading">

===Zimbra LDAP===

</div><div class="BodyAfterHead">The Zimbra Collaboration Suite uses the OpenLDAP software, an open source LDAP directory server. User authentication is provided through OpenLDAP. Each account on the Zimbra server has an unique mailbox ID that is the primary point of reference to identify the account. </div><div class="Body">The OpenLDAP schema has been customized for the Zimbra Collaboration Suite.</div><div class="a_0032Heading">

===Zimbra MTA (mail routing server)===

</div><div class="BodyAfterHead">Postfix is the open source mail transfer agent (MTA) that receives email via SMTP and routes each message to the appropriate Zimbra mailbox server using Local Mail Transfer Protocol (LMTP). The Zimbra MTA also includes the anti-virus and anti-spam components.</div><div class="a_0032Heading">

===Zimbra Store (Zimbra server)===

</div><div class="BodyAfterHead">The Zimbra store package installs the components for the mailbox server, including Apache Tomcat, which is the servlet container the Zimbra software runs within. Each account is configured on one mailbox server, and this account is associated with a mailbox that contains all the mail messages and file attachments for that mail account. </div><div class="Body">The mailbox server includes the following components:</div><div class="Bulleted1_outer" style="margin-left: 0pt">

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</div><div class="Bulleted1_outer" style="margin-left: 0pt">

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<div class="Bulleted1_inner">Index store</div>
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</div><div class="Bulleted1_outer" style="margin-left: 0pt">

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<div class="Bulleted1_inner">HTML attachment conversion utility</div>
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</div><div class="Body">Each Zimbra server has its own standalone data store, message store and index store for the mailboxes on that server. </div><div class="Body">As each mail arrives, the Zimbra server schedules a thread to have the message indexed (index store). Any attachments to the mail message are scheduled to be converted to HTML, and then the HTML version is scheduled to be indexed.</div><div class="a_0034Heading">

====Data store.====

</div><div class="Body">The '''data store''' is a MySQL database where internal mailbox IDs are linked with user accounts. The data store maps the mailbox IDs to users’ OpenLDAP accounts. This database contains each user’s set of tag definitions, folders, calendar schedules, and contacts, as well as the status of each mail message - read, unread, tags associated to message, and folder the message resides in.</div><div class="a_0034Heading">

====Message store.====

</div><div class="Body">The '''message store''' is where all email messages and file attachments reside. Messages are stored in MIME format. A message that is sent to multiple recipients who have accounts on one mailbox server are stored only once in the file system.</div><div class="a_0034Heading">

====Index store.====

</div><div class="BodyAfterHead">Index and search technology is provided through Lucene. Index files are maintained for each mailbox. </div><div class="a_0034Heading">

====HTML conversion.====

</div><div class="Body">As each email message arrives, the Zimbra server schedules a thread to have the message indexed. Any attachments to the mail message are scheduled to be converted to HTML, and then the HTML version is scheduled to be indexed. (Network Edition) </div><div class="a_0032Heading">

===Zimbra-SNMP===

Installing the Zimbra-SNMP package is optional. If you choose to install Zimbra-SNMP for monitoring, the package should be run on every server (Zimbra server, Zimbra LDAP, Zimbra MTA) that is part of the Zimbra configuration. Zimbra uses swatch to watch the syslog output to generate SNMP traps. 

===Zimbra Logger===

<div class="Body">Installing the Zimbra Logger package is optional and is installed on one mailbox server. The Zimbra logger installs tools for syslog aggregation, reporting, and message tracing. If you do not install Logger, you cannot use the message trace feature. In addition, the server statistics are not captured, and the server statistics section of the administration console will not display. </div><div class="a_0032Heading">

===Zimbra Spell===

</div><div class="Body">Installing the Zimbra Spell package is optional. Aspell is the open source spell checker used on the Zimbra Web Client. When Zimbra-spell is installed, the Zimbra-apache package is also installed.</div><div class="a_0032Heading">

===Backup Process Overview===

</div><div class="Body"> (Network Edition) Zimbra includes a configurable backup manager that resides on every Network Edition Zimbra server and performs both backup and restore functions. You do not have to stop the server in order to run the backup process. You can use the backup manager to restore a single user in the event that one user’s mailbox becomes corrupted. See Backup and Restore].

Figure 1: Zimbra Collaboration Suite System Architecture</div><div class="Anchor">[[Image:2_Overview%20System%20Architecture.2.1.1.jpg]]</div><div class="a_0032Heading">

{{Article Footer|Zimbra Collaboration 6.0, 5.0|04/16/2014}}
 [[Category:Community Sandbox]]