Microsoft Outlook Help

POP3 Errors

Problems that occur with Post Office Protocol 3 (POP3) will affect the receipt and download of your emails. You may receive any of the following error messages when MSEO experiences POP3 issues:

0x800420CB: Mail cannot be stored on server
0x800CCC90: Client response invalid
0x800CCC91: Invalid user name or user not found
0x800CCC92: Password not valid for account.
0x800CCC93: Unable to interpret response.
0x800CCC94: Command required.
0x800CCC95: No messages on server.
0x800CCC96: No messages marked for retrieval.
0x800CCC97: Message ID out of range.

POP3 errors usually occur as a result of a temporary glitch, a file corruption, or because of incorrect account details.
Check to be sure that your connection details are correct. You may have changed you account details recently and failed to note those changes in MSOE or perhaps you have initiated “caps lock” while entering your case-sensitive password. The easiest way to see if your connection details are correct is to use window’s Telnet program. This will verify whether your details are incorrect or if the error is related to another MSOE issue.

To use Telnet click “start” and choose “run”. In the prompt window, type cmd (when using Windows NT, 2000 or XP) or type command (when using Windows 95, 98 or ME). In the new window type telnet 110 then click “enter”.

At this point, you should be connected to the mail server and you should receive a response “+OK Hello there”. This response confirms that you are connected to the mail server. Type, user and hit “enter”. If the username is correct, you should get the following message “+OK Password required”. Type, pass and hit “enter”. If the password is correct, the mail server will say, “+OK Well done”.

SMTP Errors

Problems that occur with Simple Mail Transfer Protocol (SMTP) will affect your ability to send emails. You may receive any of the following error messages when MSEO experiences POP3 issues:

0x800CCC60: Invalid response.
0x800CCC61: Unknown error code.
0x800CCC62: Syntax error returned.
0x800CCC63: Parameter syntax incorrect.
0x800CCC64: Command not implemented.
0x800CCC65: Improper command sequence.
0x800CCC66: Command not implemented.
0x800CCC67: Command not available.
0x800CCC68: Mailbox is locked and busy.
0x800CCC69: Mailbox not found.
0x800CCC6A: Error processing request.
0x800CCC6B: User mailbox is known, but mailbox not on this server.
0x800CCC6C: No space to store messages.
0x800CCC6D: Storage limit exceeded.
0x800CCC6E: Invalid mailbox name syntax.
0x800CCC6F: Transaction failed.
0x800CCC78: Unknown sender.
0x800CCC79: Server rejected recipients.
0x800CCC7A: No sender address specified.
0x800CCC7B: No recipients specified.

STMP problems often occur because of a temporary glitch. However, it is possible that the outgoing mail server address is incorrect. Verify that your outgoing mail server address is correct. This is the first thing you should check.

If your outgoing mail server address is correct, test your access to port 25 and see if your email is being blocked, using a telnet client. If you can connect to the outgoing mail server through port 25, this will confirm that the issue is with the application itself or your settings.

To use Telnet click “start” and choose “run”. In the prompt window, type cmd (when using Windows NT, 2000 or XP) or type command (when using Windows 95, 98 or ME). In the new window type telnet 25 then click “enter”.

At this point, you should be connected to the mail server and you should receive a response that begins with “220”, which confirms that port 25 is open. If you do not receive the “220” response, either the mail server is not functioning properly, you're not connected to the Internet or something on your system is blocking port 25.