1) Check encryption settings

When setting up email on Outlook, you should ensure that you have used the recommended SSL/TLS according to your email provider’s specifications. If anything has changed, you may want to edit and update the connection.

• On Outlook you can access account settings
• Find the account and click Manage
• Go through the configuration settings, you can configure it with detailed steps.

2) Test on another machine

If your problem disappears when you restart your PC and occurs after a while, you can check if the same problem persists on another PC. If so, you can reset Outlook and reconfigure things to fix the problem on your computer.

3) Create a new Outlook profile

Another way to resolve these issues is to create another profile. Outlook supports multiple profiles and you can connect a set of emails to an Outlook profile. It’s convenient to separate business and personal email setups.

This is useful when profiles or data files are damaged. Go to Control Panel > Mail > Show Profiles > Add and set up a new profile with your email account to test if the problem persists.

4) Disable Add-ins (Safe Mode)

Outlook, like any other software, supports add-ins that enhance the experience. However, these add-ins can sometimes create conflicts, leading to errors like these.

To test, you can run Outlook in Safe Mode and check if the problems persist. To do this, tap Win + Rtype outlook /safethen press the Enter key. Use Outlook in this mode and monitor if the error recurs.

If there are no errors, go to Outlook > File > Options > Add-ins. Click manage, then turn them all off. After that, enable them individually and check the cause of the problem.

5) Check Windows Event Logs

Finally, you can check Windows Event Viewer for all logs related to Outlook or mail errors at the time of failure. This can provide insight into underlying issues. If you find it, you can connect to Microsoft Support or anyone who can investigate deeper system-level causes or bugs in the software.

Hope this helps.

Why does Outlook error only occur after 8-12 hours of usage but work fine after a restart?

This could be due to resource exhaustion or memory leaks over time. Specific processes (like background services or add-ins) may consume more memory or CPU resources the more the PC is used. Ultimately, this could impact Outlook’s ability to establish secure connections, leading to an encryption error. Rebooting temporarily frees these resources, allowing Outlook to function normally until the problem reoccurs.

Could hibernation or system sleep mode cause Outlook to fail after prolonged use?

System sleep or hibernation may disrupt network and encryption settings when the computer resumes operation. After resuming from sleep mode, the network connection may not be completely reset, causing issues with encrypted connections with Outlook. To avoid this, make sure network adapters are configured to stay active during sleep in Device Manager and consider temporarily disabling sleep mode to test if the problem is resolved.