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Resolving Outlook Error 0x800CCC67: A Comprehensive Guide

Outlook error 0x800CCC67 is a common issue faced by users while attempting to send emails. This error can cause frustration, as it prevents users from efficiently managing their email communication.

When the error occurs, users typically encounter an error message stating "Error 0x800CCC67" or "The server responded: 421 Cannot connect to SMTP server." In this article, we will discuss the instances when this error code appears, as well as the reasons behind it.

When does Outlook error code 0x800CCC67 appear?

Outlook error 0x800CCC67 generally appears when users are trying to send emails through their Outlook account, especially those with large attachments. Particular cases when the error is encountered include establishing a connection to the SMTP server, using antivirus, or synchronizing email folders. It is essential to understand the reasons behind this error code to effectively troubleshoot and resolve the issue.

The reasons behind Outlook sending error 0x800CCC67

  1. Incorrect SMTP settings. One of the most common causes of the error is incorrect SMTP settings in the user's email client. This may include incorrect server address, port number, or authentication details. Ensuring that these settings are accurate and up-to-date is crucial for successful email communication.
  2. Firewall or antivirus interference. Sometimes, firewall or antivirus software may block Outlook's connection to the SMTP server, resulting in error 0x800CCC67. Users should check their security software settings and ensure that Outlook is allowed to access the internet and establish a connection to the SMTP server.
  3. Corrupted Outlook profile or PST file. If the Outlook Personal Storage Table (PST) files are damaged or corrupted, it may lead to various errors, including 0x800CCC67. Running the Inbox Repair Tool (ScanPST.exe) can help detect and repair these issues, thereby resolving the error.
  4. Server timeout settings. Sometimes, the error 0x800CCC67 may occur due to server timeout settings that are too short. If the server takes longer to respond than the set time limit, Outlook will display the error message. If this error message is accompanied by a time-out error message, it indicates the same issue. In such cases, increasing the server timeout settings in Outlook can help resolve the problem.
  5. Unstable internet connection. An unstable or slow internet connection can also cause the Outlook error 0x800CCC67. When the connection is not strong enough to establish a stable link to the SMTP server, Outlook may fail to send or receive emails, resulting in the error. Ensuring a reliable internet connection is essential for avoiding such issues.
  6. Email server issues. In some cases, the error may be due to issues with the email server itself. This can happen if the server is down, undergoing maintenance, or experiencing technical difficulties. Users should check the status of their email provider's server and wait for any temporary issues to be resolved.

By understanding the various reasons behind Outlook error 0x800CCC67, users can effectively troubleshoot and resolve the issue, ensuring smooth and uninterrupted email communication.

How to fix Outlook error 0x800ccc67

To resolve Outlook error 0x800CCC67, follow these step-by-step solutions:

  1. Verify SMTP settings:
    • Open Outlook and click on File > Info > Account Settings > Account Settings.
    • In the Email tab, select your email account and click Change.
    • Check the SMTP settings for correctness (server address, port number, and authentication details). Refer to your email provider's documentation for the correct settings.
    • Click Next, then Finish, and close the "Account Settings" window.
  2. Configure firewall or antivirus software:
    • Open your firewall or antivirus software settings.
    • Look for settings related to application permissions or internet access.
    • Add Outlook to the list of allowed applications or grant it permission to access the internet.
    • Save the changes and restart your computer.
  3. Repair corrupted Outlook PST files:
    • Close Outlook and locate the ScanPST.exe tool (usually found in the Outlook installation folder).
    • Microsoft ScanPST tool
    • Run the tool and click Browse to select the PST file you wish to repair.
    • Click Start to begin scanning and repairing the PST file.
    • After the repair process is complete, open Outlook and check if the error is resolved
    • If you cannot recover corrupted Outlook PST files using ScanPST.exe, you can import your backup PST file into Outlook.
    • Advanced Import PST to Outlook tool
    We recommend regularly back up Outlook data files with automatic Backup Outlook and Export Outlook to PST utilities.
  4. Adjust server timeout settings:
    • Open Outlook and click on File > Account Settings > Account Settings.
    • In the Email tab, select your email account and click Change.
    • Click on More Settings and navigate to the Advanced tab.
    • Increase the server timeout setting (for example, to 5 minutes).
    • Click OK > Next > Finish, and close the "Account Settings" window.
  5. Check your internet connection:
    • Ensure that your internet connection is stable and at an optimal speed.
    • Try to access other websites or online services to confirm the connection quality.
    • If necessary, restart your modem or router or contact your internet service provider for assistance.
  6. Monitor email server status:
    • Check your email provider's website or social media channels for any server-related issues or maintenance updates.
    • If server issues are identified, wait for them to be resolved before attempting to send or receive emails.


Outlook error 0x800CCC67 can cause disruptions in email communication and hinder productivity. This error commonly occurs in Outlook when there are issues with the SMTP server settings or configuration, which cause difficulties in sending emails.

It is essential to identify the root cause and apply the appropriate solutions to resolve the issue. Using the appropriate add-ins mentioned in this text can greatly assist in fixing the problem quickly and easily, ensuring smooth and uninterrupted work with Outlook.

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