Mails are not sent from Plesk server. Plesk server displays Port 25 is blocked message in dashboard. It was working/sending mails till recently.
What we have tried:
• Checked that Amazon(LightSail) dashboard has port 25 open.
• Windows firewall is added with an exception to allow port 25 on both inbound and outbound rules though Firewall is managed by Symantec.
• Exception added to Symantec Endpoint protection, to allow port 25.
• Plesk Firewall also has port 25 open.
After trying all these still the Plesk server dashboard displays port 25 is blocked warning.
Any other configurations that we missed to check, any other ideas.
Also Question2Answer emails were not working with SMTP servers on Plesk. Hence defaulted to using local email on port 25.