Question
How to enable / disable submission port 587 in on a Plesk server?
Resolution
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Go to Tools & Settings > Mail Server Settings.
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Check / uncheck the setting Enable SMTP service on port 587 on all IP addresses.
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Apply the changes.
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Connect to the Plesk server via SSH (Linux) / RDP (Windows Server).
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Run the command:
# plesk bin mailserver --set-message-submission true
Note: On Windows Server, start a command prompt as an Administrator.
To disable submission port 587, run:
# plesk bin mailserver --set-message-submission false