Ports Required for a Mail Server
The ports that need to be open on a server used as a mail server:
Standard Mail Server Ports
| SMTP | 25 | tcp | Public |
| HTTP | 80 | tcp | should probably be limited by a firewall to your local network only |
| POP3 | 110 | tcp | should probably be limited by a firewall to your local network only |
| IMAP | 143 | tcp | should probably be limited by a firewall to your local network only |
| LDAP | 389 | tcp | should probably be limited by a firewall to your local network only |
| HTTPS | 443 | tcp | Public |
| SMTPS | 465 | tcp | Public |
| SMTP Submission | 587 | tcp | Public |
| IMAPS | 993 | tcp | Public |
| POP3S | 995 | tcp | Public |
| SOAP Auth | 7073 | tcp | should probably be limited by a firewall to your local network only |
| LMTP | 7025 | tcp | should probably be limited by a firewall to your local network only |
