Zimbra Application Packages ZCS includes the following application packages. Zimbra Core Includes the libraries, utilities, monitoring tools, and basic configuration files. zmconfigd is part of zimbra-core and is automatically enabled and runs on all systems. Zimbra LDAP ZCS uses the OpenLDAP software, an open source LDAP directory server. User authentication, the Zimbra Global Address List, and configuration attributes are services provided through OpenLDAP. Note that the Zimbra GAL and authentication services can be provided by an external LDAP Directory such as Active Directory. Zimbra MTA 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. Zimbra store (mailbox server) The Zimbra store package installs the components for the mailbox server, including Jetty, which is the servlet container the Zimbra software runs within. Within ZCS, this servlet container is called mailboxd. Each account is configured on one mailbox server, and this account is associated with a mailbox that contains all the mail messages, file attachments, contacts, calendar, and collaboration files for that mail account. Each Zimbra server has its own standalone data store, message store, and index store for the mailboxes on that server. As each email arrives, the Zimbra server schedules a thread to have the message indexed (Index store). Zimbra-SNMP Zimbra uses swatch to watch the syslog output to generate SNMP traps. Zimbra-Logger The Zimbra logger installs tools for syslog aggregation, reporting. If the Logger is not installed, the server statistics section of the administration console is not displayed. Zimbra-Spell 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. Zimbra-Proxy Use of an IMAP/POP proxy server allows mail retrieval for a domain to be split across multiple Zimbra servers on a per user basis. The Zimbra Proxy package can be installed with the Zimbra LDAP, the Zimbra MTA, the Zimbra mailbox server, or on its own server. Zimbra-Memcached is a separate package from zimbra-proxy and is automatically selected when the zimbra-proxy package is installed. One server must run zimbra-memcached when the proxy is in use. All installed zimbra-proxies can use a single memcached server
