How can I open port 587 on a windows VPS running Plesk?
This article will explain how you can open port 587 on your Windows VPS.
Please note: this article was originally created for our previous generation of Virtual Private Servers. As such, these instructions may not be relevant to our current generation of Virtual Private Servers.
Log in to the admin home panel.
Click the Tools & Settings link in the left hand menu.
Click the Mail Server Settings link.
Tick the Switch on message submission option on the Server-wide mail settings page.
This will then activate port 587 on your VPS.