Hi, 2 independent Plesk servers are with the same issues at the same time today. Many mails are stuck in the queue. I found the article https://support.plesk.com/hc/en-us/...*MTc0MTg1MDIyOC4yMS4xLjE3NDE4NTAzNTIuMjEuMC4w so I deinstall and reinstall Plesk Email Security Pro. The issues resolved...
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