ZCS Administrator Guide 7.2.1

Open Source Edition

Zimbra Proxy Ports for POP/IMAP

The following ports are used either by Zimbra Proxy or by Zimbra Mailbox. If you have any other services running on these ports, turn them off.

End clients connect directly to Zimbra Proxy, using the Zimbra Proxy Ports. Zimbra Proxy connects to the Route Lookup Handler or Zimbra Mailbox using the Zimbra Mailbox Ports.

 

Zimbra Proxy Ports	Port
POP3	110
POP3S (Secure POP3)	995
IMAP	143
IMAPS (Secure IMAP)	993
Zimbra Mailbox Ports	Port
Route Lookup Handler	7072
POP3 Proxy	7110
POP3S Proxy	7995
IMAP Proxy	7143
IMAPS Proxy	7993