Seeing a cryptic error code like [pii_email_37f47c404649338129d6] in Microsoft Outlook can be frustrating. This error typically signals a problem with your email’s configuration, a conflict with other accounts, or a corrupted installation file.

This guide will walk you through the most common methods to resolve this error, starting with the easiest fixes.

Method 1: Check SMTP Server Port and Authentication

This is the most common cause of the [pii_email_37f47c404649338129d6] error, as it relates to sending mail. Your port number or authentication settings may be incorrect.

1. In Outlook, go to File > Account Settings > Account Settings.
2. Double-click on the email account that is showing the error.
3. Click on More Settings… in the bottom-right corner.
4. Go to the Outgoing Server tab.
5. Make sure the box is checked for “My outgoing server (SMTP) requires authentication.”
6. Select “Use same settings as my incoming mail server.”
7. Now, go to the Advanced tab.
8. Find the Outgoing server (SMTP) port number. If it is set to 465, change it to 587.
9. Click OK to save the changes, then Next, and let Outlook test the connection.

Method 2: Update Microsoft Outlook

Running an outdated version of Outlook can cause compatibility bugs.

1. In Outlook, go to File > Office Account.
2. Click Update Options (next to “Office Updates”).
3. Select Update Now from the drop-down menu.
4. Restart Outlook once the updates are complete.

Method 3: Remove Duplicate or Conflicting Accounts

This error can occur if you have multiple accounts in Outlook, and they conflict with each other, or if you are logged into multiple accounts on your web browser.

1. Check Outlook: Go to File > Account Settings > Account Settings. Look at the list of accounts. If you see any old, duplicate, or unused accounts, click on them and select Remove.
2. Check Web Browser: If you use Outlook on the web, log out of all Microsoft accounts. Then, log back in only to the one account you need to use.

Method 4: Temporarily Disable Antivirus Software

Your antivirus or firewall program may be incorrectly blocking Outlook’s connection to the mail server.

1. Open your third-party antivirus program (e.g., Norton, McAfee, Avast).
2. Find the option to temporarily disable the firewall or “real-time protection.”
3. Close and restart Outlook and see if the error is gone.
4. Important: If this fixes the problem, re-enable your antivirus and add an “exception” or “rule” to allow Outlook.exe to communicate freely. Do not leave your antivirus disabled.

Method 5: Repair Your Microsoft Office Installation

Your Outlook program files may be corrupted. You can use the built-in Windows repair tool to fix this.

1. Close all Microsoft Office applications (Outlook, Word, Excel, etc.).
2. Open the Control Panel on your PC.
3. Go to Programs and Features.
4. Find Microsoft 365 or Microsoft Office in the list.
5. Click on it, then click the Change button at the top.
6. You will see two options. First, select Quick Repair and run the process. This is fast and fixes most common file issues.
7. If the error persists after a Quick Repair, repeat the steps but select Online Repair. This is a more thorough (but slower) process that reinstalls the program.

Quick Fix Checklist

• Change Port: Make sure the SMTP port is 587, not 465.
• Check Authentication: Ensure “My outgoing server (SMTP) requires authentication” is checked.
• Update Outlook: Go to File > Office Account > Update Now.
• Remove Duplicates: Delete old or unused accounts from File > Account Settings.
• Check Antivirus: Temporarily disable your firewall to see if it’s blocking the connection.
• Run Repair: Use the Quick Repair tool in Control Panel > Programs and Features.

Conclusion

The [pii_email_37f47c404649338129d6] error is almost always solvable by following these steps. In most cases, the issue is an incorrect port number or a simple file corruption that the repair tool can fix. If the problem continues, your final step would be to contact your email provider (e.g., GoDaddy, Google, etc.) to confirm their required server settings.