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How To Fix Outlook Express Error 0x800CCC79?

The Outlook Express error 0x800CCC79 is basically an SMTP authentication error which appears in Microsoft Outlook Express while users are trying to make an attempt to send e-mails. It is caused because the outgoing SMTP server denies accepting user’s e-mail without any proper authentication prior to sending any messages. So, in such cases messages can’t be sent because one of the recipients rejected by the server. The rejected e-mail address will appear as ‘[email protected]’ where the subject is represented as Subject ‘Re: Test’, Account. Hence it calls for a necessary action to resolve the issue faster and here we will explain the process to Fix Outlook Express Error 0x800CCC79 with detailed explanation.

Steps to troubleshoot Outlook express error 0x800CCC79

This are few easy steps discussed below by professional technicians.

Related Post:- How to Fix Password Rejected Error in Outlook Express?

Step 1: Access the account settings

  • To begin with the process of resolving the issue, first one needs to navigate to the “Tools” -> “Accounts“ icon

Step 2: Account selection

  • Next, from the “Internet Accounts” pop-up icon, simply select the account which is showing this issue and then, hit the “Properties” button.
  • Move on to the “Servers” section now and tick a check mark in front of the option displayed as “My server requires authentication“.
  • Hit on the “Apply” -> “OK” button and then, try to send an email.

Well, all the above steps will help you in overcoming this issue but still, if the error 0x800CCC79 persists, users may be needed to provide their account username as well as password. To do this, just click on the “Settings” button.


If users are unable to send emails from the Outlook Express then, they may need to adjust the SMTP server settings as it is clearly discussed above that 0x800CCC79 error occurs while emails are sent without any server authentication. Proceed to below contact details if you are still stuck up with this error.

Get in touch at Outlook Express Support Number for fixing your Outlook issues!


We welcome customers to call us at Outlook Support Number for resolving all their queries related to Outlook while working on it. Our team of experienced, skilled and highly proficient technicians is available 24*7 hours for customers to assist them in variety of complex problems anytime. Solutions are highly unique which makes us stand out the best among other top tech support brand.