Issue You cannot send emails from Plesk because outbound connections on TCP port 25 is blocked.

[Avaneesh b]

Mails are not sent from plesk server. Plesk server displays Port 25 is blocked message in dashboard. It was working/sending mails from port 25 before the warning appeared.

What we have tried:

Checked that Amazon dashboard has port 25 open. ( since the instance is hosted on AWS )

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.

 

[MarkM]

AWS restricts Port 25 by default for EC2.

Have you requested specifically to be exempted?

https://aws-portal.amazon.com/gp/aws/html-forms-controller/contactus/ec2-email-limit-rdns-request