- Plesk 11.x for Windows
- Plesk 12.0 for Windows
- Plesk 12.5 for Windows
- It is not possible to connect to port 587 on Windows server with MailEnable.
- It is not possible to connect to the server by telnet on port 587:
# telnet 192.0.2.2 587
telnet: connect to address 192.0.2.2: Connection refused
Port 587 appears filtered when trying to connect from outside:
# nmap -p587 192.0.2.2
PORT STATE SERVICE
587/tcp filtered submission
Nmap done: 1 IP address (1 host up) scanned in 0.59 seconds
- MailEnable is configured properly as it is described at the article:
Port is filtered in a firewall or by Internet Service Provider.
Note: In case Internet Service Provider blocked the port, contact their support in order to open it from their side.
Make sure that the Plesk Firewall to open port 587:
The following steps can be used to open a custom port in Windows Firewall in case the Firewall Management is switched off at Plesk:
- Open the start menu
- Type firewall
- Open Windows Firewall with Advanced Security
- Open Inbound Rules
- New Rule...
- Choose Port type
- Choose TCP, and enter the required port - in this case, 587
- Choose to Allow the connection
- Choose all three profiles (Domain+Private+Public)
- Enter a custom rule name, e.g. "Port 587"
- Press finish.
Make sure that you can connect with telnet. For example:
# telnet 220.127.116.11 587
Connected to 18.104.22.168.
Escape character is '^]'.
220 domain.tld ESMTP MailEnable Service, Version: 6.5-- ready at 05/06/14 20:38:39
You could also see knowledge base article #213932745 to check the other ports used by Plesk.