If an unexplained email error persists and restarting your computer does not resolve the issue, enable logging in Outlook and inspect the LOG file. The LOG file contains a detailed list of what Outlook did while sending and receiving messages. This special LOG file can help you locate the problem yourself or show it to your ISP's support team for analysis.
How to Fix Outlook Not Responding Issues: Troubleshooting Tips and Tricks
To enable logging in Outlook:
Go to File > Options.
In the Outlook Options dialog box, select the Advanced tab.
