How to allow SMTP port 587 on all IP Address in Plesk?

Please refer to the following steps to enable port 587 to relay your emails from Plesk.

  1. Log in to Plesk Panel using admin credentials. 

  2. Click on the Tools & Settings >> Mail Server Settings.

  3. At Mail server settings find the option called Enable SMTP service on port 587 on all IP addresses and tick the check box.
  4. Finally, click on the OK button and allow port 587 in your server firewall without fail. 

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