Step -1: Login to your Plesk control panel as an administrator user.
Step -2: On the left hand side, select Tools and Settings under Server Management
Step -3: Select Log Browser under Assistance and Troubleshooting
Step -4: Click Mail on the new page,
Step -5: It will display a combined view of all email logs for your server
Step -6: You can use the Filter by message to then search for email addresses, or IP addresses, sending or receiving email server names
Step -7: You can also enable real-time logs to get updates if any issues which are currently occurring under your server.