This document explains how to fix Microsoft Outlook error 0x800CCC79 if it is not working properly or throwing an error while installing, updating,  launching/opening, performing action like sending or receiving emails, configuring emails etc.

The error message may look like:

The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was ‘user@domain.com’. Subject ‘Re: test’, Account: ‘mail.domain.com’, Server: ‘mail.domain.com’, Protocol: SMTP, Server Response: ‘550 5.7.1 Unable to relay for user@domain.com’, Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79

This solutions applies for following version of Microsoft Outlook:

  • Outlook 2007
  • Outlook 2010
  • Outlook 2013
  • Outlook 365
  • Outlook 2016
  • Microsoft Office (2013/365/2016)
Error InformationError Descripton
Error 0x800CCC79 Outlook Overview
0x800CCC79 Error Code Log
Avg. Time to Resolve Issue   50 mins
Difficulty Hard
Log Name: Microsoft Outlook <version> 3.00
Source: Application Error
Event ID: 9748
Operating System
  • Windows 7
  • Windows 8
  • Windows 10
Level: Application Level
User: <Outlook username>
Description:
  • Faulting Application Name: Microsoft Outlook <Application name>, version: 1.3.1840.42069, time stamp: 0×71138922
  • Faulting module name: Outlook  event.dll, version: 8.5.3200.02590
  • Exception code: 0xb05g853f
  • Fault offset: 0xe09c537d
  • Faulting process ID: 0×243
  • Faulting application start time: 0x02geed8a98279480
  • Faulting application path: ~<userpath>
  • Faulting module path: ~C:\Program Files (x86)\Microsoft Outlook\<appname>
  • Report ID: d4f82a62-4839-91e8-9182-3534bfe2a656

Cause of 0x800CCC79 Outlook Error Code

  • DNS Conflict
  • SSL/Port Blocked
  • Outlook Configuration corrupt

Steps to resolve Outlook Error Code 0x800CCC79

Step 1: Start Outlook in Safe Mode:

1. Hold Windows Key + R. Run Dialogue Box will open up.
2. Enter “Outlook /safe” and Click OK.

Step 2: Temporarily Disable any installed 3rd Party Antivirus:

Some times Antivirus/Malware/Adware programs mark Microsoft office installer files as Spam and block it from installing. Please refer your vendors website for disabling it temporarily. Once installation is done you can activate it again.

In most cases Outlook error code 0x800CCC79 should be resolved by following above steps. If however the issue still persists it means there is some critical issue with your system which needs to be fixed manually and is recommended to be done by an experienced Computer Technician.

You can chat one-on-one with one of our Outlook Support Representative 24/7 by clicking on the Chat button.

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Last Updated: 27/01/2016
Solution ID: 656721

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    Posted In: Microsoft Outlook

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