Fix Outlook error 0x800CCC1A during send/receive operation.

1) Check your encryption settings.

When setting up email in Outlook, you need to ensure that you are using the recommended SSL/TLS according to your email provider’s specifications. If something has changed, you may want to change and update the connection.

• In Outlook, you can go to your account settings.
• Find your account and click Manage.
• Run the configuration settings, you can configure them with detailed steps.

2) Check on another machine

If the problem goes away after restarting your computer and persists after some time, you can check if the same problem persists on another computer. In this case, you can restart Outlook and set everything up again to fix the problem on your computer.

3) Create a new Outlook profile

Another way to solve such problems is to create a different profile. Outlook supports multiple profiles and you can connect a set of emails to an Outlook profile. It’s convenient to separate your work and personal email settings.

This helps if 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 check if the problem persists.

4) Disable add-ons (safe mode)

Outlook, like any other software, supports add-ons to enhance your experience. However, these add-ons can sometimes create conflicts that lead to these types of errors.

For testing you can run Outlook in Safe Mode and check if the problems persist. To do this, click Victory + Rtype outlook /safeand press Enter. Use Outlook in this mode and watch for the error to reoccur.

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

5) Review the Windows event logs.

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

Hope this helps.

Why does Outlook error only appear after 8-12 hours of use, but after reboot it works fine?

This could be due to resource exhaustion or memory leaks over time. Certain processes (such as background services or add-ons) may consume more memory or CPU resources as your PC is used. This may ultimately affect Outlook’s ability to establish secure connections, resulting in an encryption failure. A restart temporarily frees up these resources, allowing Outlook to function normally until the problem occurs again.

Can system hibernation or hibernation cause Outlook to crash after prolonged use?

Putting the system to sleep or hibernation may disrupt network and encryption settings when the computer resumes operation. After resuming from sleep mode, the network connection may not fully reinitialize, causing Outlook to experience problems with encrypted connections. To prevent this, make sure your network adapters are configured to run during sleep in Device Manager and consider temporarily disabling sleep mode to see if the problem is resolved.