Zimbra Proxy Ports for POP and 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
