- Plesk for Linux
Sending or receiving mail does not work.
Qmail is used as the mail server as shown in Plesk in Tools & Settings > Mail Server Settings > Installed mail server.
Port 25 is not listened by any service (to check it, it is necessary to connect to the server using SSH):
# netstat -tulpn | grep :25
Port 25 is not listened by any service.
Connect to the server using SSH.
Repair the mail services configuration:
# plesk repair mail
Restart the service
xinetd(Qmail works under it):
# service xinetd restart