Outlook Error 0x800ccc78: Easy And Simple Fixes

While sending an email, if Outlook generates an error message reading “Microsoft outlook error 0x800ccc78”, don’t be frustrated. It can be easily fixed if you become aware of the root of this error. 

This error generally occurs, if you have not enabled SMTP. Besides that, you can also encounter this error due to an invalid port number. 

If you are currently looking for solutions to fix this typical error on your device, then follow this article. Hopefully, the fixes provided here will help you resolve this error with high accuracy.  

Fixes for Outlook Error 0x800ccc78

Here are some effective fixes, which you can utilize to resolve this error very quickly. 

Method 1: Enable SMTP Option

If you have disabled SMTP option, then you can encounter this error. So, you can enable the SMTP option, in order to resolve this issue. 

  1. Firstly, open Microsoft Outlook, click on Tools and tap on “Account Settings”.
  2. Sometimes, you can also get this Account Settings option under the File menu bar.
  3. Now, you will get to the Account settings window and on that window, click on the Email option. 
  4. After that, you will find that the window of Add New E-mail Account will appear, tap on More-Settings. 
  5. Now, you will see the ‘Internet E-mail Settings’ screen. Click on the checkboxes named “My outgoing server (SMTP) requires authentication” and “Use same settings as my incoming mail server”. 
  6. Click on Ok.

After that, restart the Outlook application and try to send an email again. 

Method 2: Change Port Number

Another possible reason to encounter Microsoft Outlook Error 0x800ccc78 is if the port number has been changed by your internet service provider.

  1. Firstly, you need to open the Outlook Application. Now, click on Tools and choose  Account Settings.
  2. After that, in the settings window, click on Change. 
  3. Click on More Settings situated in the Add New E-mail Account and click on the Advanced tab.
  4. Now, you will see a port number of IMAP and SMTP. Next, set the port number 587 for the Outgoing server and click on the Ok button. 
  5. Click on Next and then the Finish button. 

Now, check whether you are still getting this error or not. If yes, try to follow the alternative method given below.

Method 3: Repair PST by Inbox Repair Tool

If all the previous methods fail to resolve this error, you can repair your inbox using the inbox repair tool provided by Microsoft. To perform this action, try to follow these steps:

  1. Firstly, use the Windows key and the R key at the same time to launch the Run dialog box. 
  2. After that, type this path and hit the Ok button to continue: C:\Program Files (x86)\Microsoft Office\root\Office16. For Office 2016, Office 2019, and Office 365. 
  3. In case, you are using Outlook 2013, use this path: C:\Program Files (x86)\Microsoft Office\Office15. For older versions, change “Office15” in the path to “Office14” for Outlook 2010, or to “Office13” for Outlook 2007 in the path.
  4. After that, open the Microsoft Outlook Inbox Repair by double-clicking on SCANPST.EXE.
  5. Next, click on the Browse button.
  6. After that, you need to locate the .pst file which you want to repair. 
  7. Click on the Open button followed by the Start button.
  8. Check the box against Make a backup of scanned file before repairing option (just in case).
  9. After that, click on the Repair button.

In this way, you will be able to fix this error on your own. 

To Conclude

In this article, expert technicians have provided a step by step guide using which you will be able to resolve this Outlook error 0x800ccc78 very quickly. If you require any further guidance, you can always contact an expert who can guide you better. Share your valuable thoughts with us via your valuable comments.