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IMAP

Table of Contents

{product-name} has a built-in IMAP server which is installed by default and is part of zimbra-mailboxd process (Zimbra Mailbox Server).

Common IMAP Configuration settings

The following global and server level configuration attributes are available to control and tune the IMAP service.

  • zimbraImapServerEnabled. When set to TRUE, in-process IMAP server is enabled. When set to FALSE, in-process IMAP server is disabled. Default value is TRUE.

  • zimbraImapSSLServerEnabled. When set to TRUE, in-process IMAP SSL server is enabled. When set to FALSE, in-process IMAP SSL server is disabled. Default value is TRUE

  • zimbraImapBindAddress (can be set only on server level). Specifies interface address on which in-process IMAP server should listen; if empty, binds to all interfaces.

  • zimbraImapBindPort. Specifies port number on which in-process IMAP server should listen. Default value is 7143.

  • zimbraImapSSLBindAddress (can be set only on server level). Specifies interface address on which in-process IMAP SSL server should listen; if empty, binds to all interfaces.

  • zimbraImapSSLBindPort. Specifies port number on which in-process IMAP SSL server should listen on. Default value is 7993.

  • zimbraImapNumThreads. Specifies number of threads in IMAP handler’s thread pool. {product-name} uses IMAP NIO by default, which allows each IMAP handler thread to handle multiple connections. The default value of 200 is sufficient to handle up to 10,000 active IMAP clients.

  • zimbraImapCleartextLoginEnabled. Specifies whether or not to allow cleartext logins over a non SSL/TLS connection. Default value is FALSE.

  • zimbraImapProxyBindPort. Specifies port number on which IMAP proxy server should listen. Default value is 143. See Zimbra Proxy Components for more information.

  • zimbraImapSSLProxyBindPort. Specifies port number on which IMAP SSL proxy server should listen. Default value is 993. See Zimbra Proxy Components for more information.

  • zimbraImapMaxRequestSize. Specifies maximum size of IMAP request in bytes excluding literal data. Note: this setting does not apply to IMAP LOGIN requests. IMAP LOGIN requests are handled by IMAP Proxy (Zimbra Proxy Components) and are limited to 256 characters.

  • zimbraImapInactiveSessionCacheMaxDiskSize. Specifies the maximum disk size of inactive IMAP cache in Bytes before eviction. By default this value is 10GB. This is a rough limit, because due to internals of Ehcache actual size on disk will often exceed this limit by a modest margin.

  • zimbraImapInactiveSessionEhcacheSize. Specifies the maximum heap size of the inactive session cache in Bytes before eviction. By default this value is 1 megabyte. This is a rough limit, because due to internals of Ehcache actual size in memory will often exceed this limit by a modest margin.

  • zimbraImapActiveSessionEhcacheMaxDiskSize. Specifies the maximum amount of disk space the imap active session cache will consume in Bytes before eviction. By default this value is 100 gigabytes. This is a rough limit, because due to internals of ehcache actual size in memory will often exceed this limit by a modest margin.