- Plesk for Linux
Unable to send emails via mail client with the smtp 587 port configured.
nmaputility shows that the port is closed:
# nmap 203.0.113.2 -p587
PORT STATE SERVICE
587/tcp closed submission
Unable to telnet to the port 587:
# telnet 203.0.113.2 587
telnet: connect to address 203.0.113.2: Connection refused
netstatutility shows that no service is listening on port 587:
# netstat -tunalp | grep 587
When the option Tools & Settings > Mail Server Settings > Enable SMTP service on port 587 on all IP addresses is disabled, the service is not used and thus port is not opened.
If it is required, open port 587 by following the next steps
Go to Tools & Settings > Mail Server Settings.
Turn on the Enable SMTP service on port 587 on all IP addresses directive and press the OK button.