Default Ports Used by Zimbra

   KB 1391        Last updated on 03/25/2016  

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You may choose not to allow remote connections to all of the external ports depending on which services you want to make available. In general, it is best to be restrictive as possible.

External Access

These are ports typically available to mail clients.

Port Protocol Zimbra Service Description
25 smtp mta incoming mail to postfix
80 http mailbox / proxy web mail client (disabled by default in 8.0)
110 pop3 mailbox / proxy POP3
143 imap mailbox / proxy IMAP
443 https mailbox / proxy - web mail client HTTP over TLS
465 smtps mta Incoming mail to postfix over TLS (Legacy Outlook only? If possible, use 587 instead)
587 smtp mta Mail submission over TLS
993 imaps mailbox / proxy IMAP over TLS
995 pop3s mailbox / proxy POP3 over TLS
3443 https proxy User Certificate Connection Port (optional)
9071 https proxy admin console HTTP over TLS (optional)

Internal Access

These are ports typically only used by the Zimbra system itself.

Port Protocol Zimbra Service Description
389 ldap ldap LC(ldap_bind_url)
636 ldaps ldaps if enabled via LC(ldap_bind_url)
3310 - mta/clamd zimbraClamAVBindAddress
7025 lmtp mailbox local mail delivery; zimbraLmtpBindAddress
7026 milter mailbox zimbra-milter; zimbraMilterBindAddress
7047 http conversion server Accessed by localhost by default; binds to '*'
7071 https mailbox admin console HTTP over TLS; zimbraAdminBindAddress
7072 http mailbox ZCS nginx lookup - backend http service for nginx lookup/authentication
7073 http mailbox ZCS saslauthd lookup - backend http service for SASL lookup/authentication (added in ZCS 8.7)
7110 pop3 mailbox Backend POP3 (if proxy configured); zimbraPop3BindAddress
7143 imap mailbox Backend IMAP (if proxy configured); zimbraImapBindAddress
7171 - zmconfigd configuration daemon; localhost
7306 mysql mailbox LC(mysql_bind_address); localhost
7307 mysql logger logger (removed in ZCS 7)
7780 http mailbox spell check
7993 imaps mailbox Backend IMAP over TLS (if proxy configured); zimbraImapSSLBindAddress
7995 pop3s mailbox Backend POP3 over TLS (if proxy configured); zimbraPop3SSLBindAddress
8080 http mailbox Backend HTTP (if proxy configured on same host); zimbraMailBindAddress
8443 https mailbox Backend HTTPS (if proxy configured on same host); zimbraMailSSLBindAddress
8465 milter mta/opendkim OpenDKIM milter service; localhost
10024 smtp mta/amavisd to amavis from postfix; localhost
10025 smtp mta/master opendkim; localhost
10026 smtp mta/amavisd "ORIGINATING" policy; localhost
10027 smtp mta/master postjournal
10028 smtp mta/master content_filter=scan via opendkim; localhost
10029 smtp mta/master "postfix/archive"; localhost
10030 smtp mta/master 10032; localhost
10031 milter mta/cbpolicyd cluebringer policyd
10032 smtp mta/amavisd (antispam) "ORIGINATING_POST" policy
10663 - logger LC(logger_zmrrdfetch_port); localhost
23232 - mta/amavisd amavis-services / msg-forwarder (zeromq); localhost
23233 - mta/amavisd snmp-responder; localhost
11211 memcached memcached nginx route lookups, mbox cache (calendar, folders, sync, tags); zimbraMemcachedBindAddress

System Access and Intra-Node Communication

In a multi-node environment the typical communication between nodes required includes:

Please note: this table is a WORK IN PROGRESS

Destination Source(s) Description
22 *ALL* SSH (system & zmrcd): host management
udp/53 *ALL* DNS (system ¦ dnscache): name resolution
udp/514 *ALL* syslog: system and application logging
389 *ALL* all nodes talk to LDAP server(s)
25 ldap sent email (cron jobs)
25 mbox sent email (web client, cron, etc.)
3310 mbox zimbraAttachmentsScanURL (not set by default)
11211 mbox mbox metadata data cache
11211 proxy backend mailbox route cache
Mailbox (mbox)
80 proxy backend proxy http
110 proxy backend proxy pop3
143 proxy backend proxy imap
443 proxy backend proxy https
993 proxy backend proxy imaps
995 proxy backend proxy pop3s
7025 mta all mta talk to any mbox (LMTP)
7047 mbox localhost by default; zimbraConvertdURL
7071 mbox all mbox talk to any mbox (Admin)
7072 proxy zmlookup; zimbraReverseProxyLookupTarget
7073 mta sasl auth; zimbraMtaAuthTarget (since ZCS 8.7)
Verified Against: unknown Date Created: 4/4/2006
Article ID: https://wiki.zimbra.com/index.php?title=Ports Date Modified: 03/25/2016

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