List of default ports used by Zimbra Mail Server
The network ports used by Zimbra mail server can be divided into two groups:
- External Access - Ports accessed by Clients or other services outside the Zimbra system. The ports below must be opened in the firewall for the system to operate smoothly.
| Port | Service |
| 25 | [mta] - incoming mail to postfix |
| 80 | http [mailbox] - web mail client |
| 110 | pop3 [mailbox] |
| 143 | imap [mailbox] |
| 443 | https [mailbox] - web mail client over ssl |
| 465 | [mta] - incoming mail to postfix over ssl (Outlook only) |
| 587 | [mta] - Mail submission over tls |
| 993 | [mailbox] - imap over ssl |
| 995 | pops [mailbox] - pop over ssl |
| 7071 | https [mailbox] - admin console |
2. Internal Access - Service ports used within the Zimbra system itself.
| Port | Service |
| 389 | ldap [ldap] |
| 636 | ldaps [ldaps, if enabled] |
| 7025 | lmtp [mailbox] - local mail delivery |
| 7047 | conversion server |
| 7306 | mysql [mailbox] |
| 7307 | mysql [logger] - logger |
| 7780 | http [mailbox] - spell check |
| 10024 | smtp [mta] - to amavis from postfix |
| 10025 | smtp [mta] - back to postfix from amavis |
