How to Fix Outlook Error 0x800ccc78?

In this article, we are going to discuss how to fix Outlook error 0x800ccc78. Keep continuing and find out some effective ways to resolve this issue.

Outlook is a desktop-based email client provided by Microsoft. It is the most widely used email client for email management. Sometimes, users encounter error 0x800ccc78 when they try to send emails through Outlook. It restricts users from sending emails while still allowing them to receive emails. This error indicates that Outlook is not configured properly, please verify the email address in account properties.

Why Error 0x800ccc78 Occurs in Outlook? Incorrect outgoing server settings are the main reason for this error. Corrupted Outlook profile, authentication issues, and using an outdated Outlook version also could be the reasons for this error.

Now, the question arises of how to fix the 0x800ccc78 error in Outlook. You can resolve this error by checking SMTO server settings, uninstalling firewalls, and antiviruses, updating Outlook, etc.

How to Fix Outlook Error 0x800ccc78?

Follow the below-given methods to resolve this error-

1. Enable SMTP Server Option

If your Outgoing Server Settings are disabled or incorrect then it may cause this error. Follow the below given step to enable it-

1. Open Outlook and navigate to Tools >> Account Settings.
   
2. Click on E-Mail under Account Settings window.
   
3. Now, click on More Settings.
   
4. Click on Outgoing server tab and tick the box of My Outgoing Server requires authentication and Use Same Settings as my Incoming Mail Server. Once done then click Ok.
   

After that restart Outlook and try to send emails to check error is solved or not.

2. Reset Outgoing Port Number

1. Open Outlook and click on Tools to select Account Settings.
   
2. Click on E-Mail >> Change under Account Settings window and then click on More Settings.
   
3. Click on the Advanced tab and change the Outgoing SMTP Port Number as 587 and then press Ok.
   

3. Update Outlook

An outdated Outlook version may also cause of various Outlook issues. So, ensure that you are using the updated version and check there are no pending updates. To do it-

• Open Outlook and go to File tab.
• Click on Office Account.
• Select Update Options and click on Update Now.
  

4. Disable Firewall and Antivirus

Sometimes firewall or antivirus can cause of this issue. So, temporarily disable them and check error is solved or not.

5. Repair Corrupted PST File

1. Close Outlook and locate ScanPST.exe on your system.
   
2. Browse the Outlook data file.
3. Click on Start to initiate the scanning process.
   
4. It displays the errors after scanning. Click on Repair to start the repair process.
   

After that, open Outlook and import the healthy PST file to check error is solved or not.

Conclusion

Users face 0x800ccc78 error in Outlook during sending emails. It is a frustrating issue. So, in this post, we have discussed how to fix Outlook error 0x800ccc78. Above mentioned methods help you resolve this issue.