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Outlook Error Codes

If you use Microsoft Outlook or Outlook Express, you might run into errors when you try to send or receive emails. Common causes include incorrect server settings, wrong port numbers, authentication issues, or problems with your firewall or internet provider.

This guide lists common IMAP and POP3 error messages and provides simple solutions to help you fix them quickly.

Outlook Express messages

SMTP Authentication Error (550 – 0x800CCC69)

IMAP and POP3 Error: An unknown error has occurred. Subject 'test', Account: 'mail.domain.com', Server: 'mail.domain.com', Protocol: SMTP, Server Response: '550 External MTAs must be authenticated in order to send e-mails', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC69

Solution: Needs Outgoing Server Requires Authentication checked.

Incorrect SMTP Port (0x800CCC0E)

IMAP and POP3 Error: The connection to the server has failed. Account: 'mail.domain.com', Server: 'mail.domain.com', Protocol: SMTP, Port: 255, Secure(SSL): No, Socket Error: 10061, Error Number: 0x800CCC0E

Solution: Port 255? It should be port 25 or 26.

Login Failed / Password Rejected (0x800CCC90 / 0x800CCC92)

IMAP Error: The server has rejected your login. Please verify that your username and password are correct.

POP3 Error: There was a problem logging onto your mail server. Your Password was rejected. Account: 'mail.domain.com', Server: 'mail.domain.com', Protocol: POP3, Server Response: '-ERR Login failed.', Port: 110, Secure(SSL): No, Server Error: 0x800CCC90, Error Number: 0x800CCC92

Solution: Possibly not using full email address as username. Possibly needs to reset the password.

Host Could Not Be Found (0x800CCC0D)

IMAP Error: The host 'mail.domain.com' could not be found. Please verify that you have entered the server name correctly.

POP3 Error: The host 'mail.domain.com' could not be found. Please verify that you have entered the server name correctly. Account: 'mail.domain.com', Server: 'mail.domain.com', Protocol: POP3, Port: 110, Secure(SSL): No, Socket Error: 11004, Error Number: 0x800CCC0D

Solution: Could be misspelled, could be propagating/unregistered, could be server down. The best solution is to use the correct domain and spell correctly, and if it still does not working work, then use the server's IP instead.

Secure Password Authentication (SPA) Error (0x800CCC18)

IMAP Error: General authentication failed. None of the authenticated methods supported by your IMAP server (if any) is supported on this computer.

POP3 Error: Unable to log on to the server using Secure Password Authentication. Account: 'mail.domain.com', Server: 'mail.domain.com', Protocol: POP3, Server Response: '-ERR Invalid command.', Port: 110, Secure(SSL): No, Server Error: 0x800CCC90, Error Number: 0x800CCC18

Solution: User has logged on using Secure Password Authentication checked. Needs to uncheck SPA.

Incorrect Incoming Port (0x800CCC0E)

IMAP Error: The connection to the server has failed.

POP3 Error: The connection to the server has failed. Account: 'mail.domain.com', Server: 'mail.domain.com', Protocol: POP3, Port: 1100, Secure(SSL): No, Socket Error: 10061, Error Number: 0x800CCC0E

Solution: The incoming port is wrong. Should be 110 for POP3 and 143 for IMAP.

SSL Port Mismatch (0x800CCC0F)

IMAP Error: Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity.

POP3 Error: Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity. Account: 'mail.domain.com', Server: 'mail.domain.com', Protocol: POP3, Port: 110, Secure(SSL): Yes, Error Number: 0x800CCC0F

Solution: Customer is using a secure connection, but a regular incoming port. Should be 993 for IMAP and 995 for POP3.

IMAP Root Folder Path Error (IMAP Only)

Error: Your specified Root Folder of 'public_html' could neither be found nor created. Please verify that your Root Folder Path is correct and that your IMAP account is properly configured.

Solution: Customer tried to set the "Root folder path:", but it should stay blank. IMAP only.

 

Official Microsoft Outlook Error Codes Reference

Error Code Description / Resolution
0x800CCC65 This error code is indicative that a local firewall, such as Zone Alarm, or anti-virus software, such as NOD32, Norton Antivirus, or McAfee, is blocking outgoing connections to your mail server. Try disabling any of this software and see if this error still persists.
0x800CCC67 This error is mostly attributed to one of a few things: the ISP is blocking port 25, a local firewall or anti-virus program is blocking SMTP communication, or the account in Outlook is set up incorrectly. Please change the SMTP port from 25 to 26, and disable any firewalls or anti-virus software.
0x800CCC78 Your sender address must be a full email address, not simply a username. Please set up your account in Outlook/Outlook Express to use a full account name, such as [email protected], instead of simply 'username'
0x800CCC79 Please make sure that your client is set up to authenticate SMTP before POP, as this is what the error code 0x800CCC79 indicates is the problem.
0x800CCC92 Please access your cPanel as the error 0x800CCC92 indicates, there may be a problem with the password for the email account in question, or that the email account has become corrupted.
0x8004210B Please check the following Microsoft Documentation link, as this is a client-side issue: Outlook error 0x8004210B
0x8004210A Please check the following Microsoft Documentation link, as it is client-side: Reported error 0x8004210A
0x800C0133 Please check the following Microsoft newsgroup link, as it seems that your Outlook Express mail store is corrupt: Outlook Express Error Message 0x800C0133.
0x800CCC19 Please check the following Microsoft Documentation link, as it seems to be a client-side problem with local anti-virus software: Windows Live Mail Error ID: 0x800CCC19
0x800CCC0D Please check the following Microsoft Documentation link, as it describes common work fixes for the error you're experiencing: Outlook Error 0x800ccc0d
0x800CCC0E Please check the following Microsoft Documentation link, as it describes how your ISP is blocking ports needed for email access: Outlook Error 0x800CCC0E
0x800CCC0F Please check the following Microsoft Documentation link, as it could be due to many things client-side, from local firewalls: Error Code 0x800ccc0
0x800CCC0B Please check the following Microsoft Documentation link, as it describes common work fixes for the error you're experiencing: Error code: 0x800CCC0B
0x800CCC69 Outgoing server requires authentication. Ensure “My outgoing server (SMTP) requires authentication” is checked.
0x800CCC90 Login failed — Incorrect password or username. Verify credentials or reset password.
0x800CCC18 Secure Password Authentication (SPA) is not supported. Uncheck SPA in your mail client settings.

 

Try the following steps in addition to what is found in the article:

  1. Your email client is misconfigured
  2. Your ISP is blocking access to port 25
  3. There is a DNS problem with your ISP
  4. There is an error with SMTP on one of our servers


Below you will find the most common solutions to fix the above problems:

  1. Shutdown and restart your computer.
  2. Complete email address for Email Address & User ID.
  3. POP, IMAP, and SMTP will be mail.your-domain-name.com.
  4. Make sure the Outgoing server has selected Requires Authentication.
  5. Change the Outgoing Port from 25 to 26. Many ISPs are now blocking port 25 to prevent their clients from spamming.
  6. Temporarily turn off all virus and/or firewall software.
  7. Try the ISP's outgoing mail server if the problem persists.
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