NOTABLE WEB - Support Center

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

Needs Outgoing Server Requires Authentication checked.
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IMAP and POP3
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

Port 255? Should be port 25 or 26.
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IMAP
The server has rejected your login. Please verify that your user name and password are correct.

POP3
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

Possibly not using full email address as username. Possibly needs to reset password.
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IMAP
The host 'mail.domain.com' could not be found. Please verify that you have entered the server name correctly.

POP3
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

Could be misspelled, could be propagating/unregistered, could be server down. Best solution is to use correct domain and spell correctly, and if still not working then use the server's IP instead.
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IMAP
General authentication failed. None of the authenticated methods supported by your IMAP server (if any) are supported on this computer.

POP3
Unable to logon 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

User has Log on using Secure Password Authentication checked. Needs to uncheck SPA.
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IMAP
The connection to the server has failed.

POP3
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

Incoming port is wrong. Should be 110 for POP3 and 143 for IMAP.
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IMAP
Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity.

POP3
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

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

Customer tried to set the "Root folder path:", but it should stay blank. IMAP only.
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Official descriptions from Microsoft

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 setup incorrectly.  Please change the SMTP port from 25 to 26, 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 username@mydomain.com 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: http://support.microsoft.com/kb/827349 .

0x8004210A -- Please check the following Microsoft Documentation link as it is client-side: http://support.microsoft.com/kb/827349 .

0x800C0133 -- Please check the following Microsoft newsgroup link as it seems that your Outlook Express mail store is corrupt: https://www.microsoft.com/communities/newsgroups/en-us/...

If that does not work, please see this link for information on disabling your virus scanner's Outlook Express integration. http://www.microsoft.com/communities/newsgroups/en-us/...

0x800CCC19 -- Please check the following Microsoft Documentation link as it it seems to be a client-side problem with local anti-virus software: http://support.microsoft.com/kb/813518 .

0x800CCC0D -- Please check the following Microsoft Documentation link as it describes common work fixes for the error you're experiencing: http://support.microsoft.com/kb/813514 .

0x800CCC0E -- Please check the following Microsoft Documentation link as it describes how your ISP is blocking ports needed for email access: http://support.microsoft.com/kb/191687 .

0x800CCC0F -- Please check the following Microsoft Documentation link as it could be due to many things client-side from local firewalls: http://support.microsoft.com/kb/813514 .

0x800CCC0B -- Please check the following Microsoft Documentation link as it describes common work fixes for the error you're experiencing: http://support.microsoft.com/kb/827349 .

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

1. Your email client is mis-configured
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, SMTP will be mail.your-domain-name.com.
4. Make sure 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.