How To Fix [pii_email_647e431cb3bcb192253a] Error Solved?

The [pii_email_647e431cb3bcb192253a] error code is one of the many error codes that Outlook users may come across. This error code is caused by a conflict with the Microsoft Outlook program and the Simple Mail Transfer Protocol (SMTP) server. When this error code occurs, it is usually accompanied by the following error message: “The message could not be sent because the server rejected the sender’s email address. The error code is 0x800CCC79.” There are a few different ways that this error code can be fixed. 

What are the possible causes of the [pii_email_647e431cb3bcb192253a] error?

The [pii_email_647e431cb3bcb192253a] error can be caused by a number of factors, including:

  1. Incorrect Outlook configuration
  2. Corrupted Outlook data files
  3. A conflict with another email program
  4. A problem with your operating system
  5. Another possible cause is that there is a problem with the SMTP server.
  6. Another possible cause is that the email account that is being used is not a valid email account.

Ways to Fix the [PII_EMAIL_647E431CB3BCB192253A] Error

There are several ways to fix the error code [pii_email_647e431cb3bcb192253a]. They are as follows:

1. Clear the Cache and Cookies

When the browser is used to access the Outlook Account, clearing out any caches and cookies will help with this error.

2. Use the web version of Microsoft Outlook

Using the web version of Microsoft Outlook instead of the desktop client can also help resolve this error.

3. Check your anti-virus settings

Checking the anti-virus settings, as some anti-viruses cause conflicts with Outlook and block it from being able to synchronize properly.

3. Fix corrupted Outlook data files

One of the solutions that may fix the problem is to fix corrupted Outlook data files. To do this, you can use the built-in Outlook Repair Tool. This tool can scan for and fix corrupted Outlook data files.

4. Reinstall Microsoft Office

If the solutions above have not been able to fix the error, you may need to reinstall Microsoft Office. This will ensure that all of the components of Outlook are in their proper places and working properly.

5. Change the server port settings

When you are using Outlook with an email account that is hosted by a different provider, you may need to change the server port settings. To do this, you can follow these steps:

  1. Open Outlook and go to the File menu
  2. Click on Account Settings
  3. Click on the account that is causing the error
  4. In the Server Port section, type in the correct port number for the SMTP server
  5. Click on OK
  6. Close and reopen Outlook.

7. Use a third-party Outlook repair tool

If the [pii_email_647e431cb3bcb192253a] error is not resolved by any of the methods above, you may need to use a third-party Outlook repair tool. There are a number of these tools available, and they can scan for and fix corrupted Outlook data files.

8. Contact Microsoft Support

If none of the above solutions work, then it is advisable to contact Microsoft Support for further assistance. They will be able to investigate the error code and provide any additional help required.

These are the possible causes and solutions to the error code pii_email_647e431cb3bcb192253a. It is important to try each solution before moving on to the next one, as some may work better than others depending on the exact cause of the problem.

Additionally, if all else fails, it is recommended to contact Microsoft Support for assistance. They will be able to investigate the error code and provide any additional help required.

How to prevent the [pii_email_647e431cb3bcb192253a] error from happening again?

1. Update your system frequently

Make sure your Windows and Office applications are up to date. Staying on top of the latest updates can help prevent any errors due to outdated software.

2. Create a backup

If you have important data or files, back them up before making any changes. This will help ensure that you don’t lose any important information in case something goes wrong.

3. Check your email settings

Another common cause of the pii_email_647e431cb3bcb192253a error is incorrect or outdated email settings. Make sure that you’re using the correct server and port number, as well as up-to-date authentication information.

4. Try a different email client

If you’re still experiencing issues, try using a different email client (such as Outlook or Thunderbird). This could help resolve any compatibility issues that may be causing the error.

5. Contact your email provider

If all else fails, contact your email provider and ask them to help you troubleshoot the problem. They may be able to provide specific information about how to fix the error on their end.

6. Contact a professional

If your email provider isn’t able to help you resolve the issue, contact a computer repair company or IT specialist for assistance. They should be able to diagnose and fix any underlying issues that may be causing the pii_email_647e431cb3bcb192253a error.


The error code [pii_email_647e431cb3bcb192253a] can be fixed by following the methods given above. If the error code still appears, then contact the Microsoft support team for further assistance.

Thanks for reading!

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