SMTP Errors

This is a lit of SMTP Errors which you may come across when using Microsoft Outlook. To find a specific error code, press CTRL+F and type it into the search bar.

0x800420C8 - Message could not be opened

1. See this Microsoft KB article.

0x800CCC60 - Invalid response

1. Recheck account information (mail servers and login information). If "my server requires authentication" is ticked, ensure it is set to "use same settings as incoming mail server". Check SSL settings.
2. Recreate the mail account.
3. Disable any antivirus or firewall software.

0x800CCC61 - Unknown error code

1. Recheck account information (mail servers and login information). If "my server requires authentication" is ticked, ensure it is set to "use same settings as incoming mail server". Check SSL settings.
2. Recreate the mail account.
3. Disable any antivirus or firewall software.

0x800CCC62 - Syntax error returned

1. Check the syntax of messages in the outbox. Clear the outbox and recreate a test message.
2. Recheck account information (mail servers and login information). If "my server requires authentication" is ticked, ensure it is set to "use same settings as incoming mail server". Check SSL settings.
3. Recreate the mail account.
4. Disable any antivirus or firewall software.

0x800CCC63 - Parameter syntax incorrect

The computer name in the network configuration contains punctuation. Ensure the computer name is simple ASCII with no space characters or special characters. Do not include the domain name of your ISP.

1. Recheck account information (mail servers and login information). If "my server requires authentication" is ticked, ensure it is set to "use same settings as incoming mail server". Check SSL settings.
2. Recreate the mail account.
3. Disable any antivirus or firewall software.

0x800CCC64 - Command not implemented

Recheck account information (mail servers and login information). If "my server requires authentication" is ticked, ensure it is set to "use same settings as incoming mail server". Check SSL settings.

1. Recreate the mail account.
2. Disable any antivirus or firewall software.

0x800CCC65 - Improper command sequence

1. Recheck account information (mail servers and login information). If "my server requires authentication" is ticked, ensure it is set to "use same settings as incoming mail server". Check SSL settings.
2. Recreate the mail account.
3. Disable any antivirus or firewall software.

0x800CCC66 - Command not implemented

1. Recheck account information (mail servers and login information). If "my server requires authentication" is ticked, ensure it is set to "use same settings as incoming mail server". Check SSL settings.
2. Recreate the mail account.
3. Disable any antivirus or firewall software.

0x800CCC67 - Command not available

1. Check for any mail outages.
2. Recheck account information (mail servers and login information). If "my server requires authentication" is ticked, ensure it is set to "use same settings as incoming mail server". Check SSL settings.
3. Recreate the mail account.
4. Disable any antivirus or firewall software.

0x800CCC68 - Mailbox is locked and busy

1. You may be logged in on another machine. Close all connections on all machines and wait 20 minutes to check again.
2. Some mail servers will not recognize an improper disconnection in some instances. Your account may be "Poplocked". You can either wait for the "poplock" to time out, or have someone shell into the mail server and kill the mail task running on your account. This normally only happens with accounts that have UNIX shells.
3. If you are not logged in on another machine or poplocked, then someone may be using/downloading from your account, or something is wrong with your account.

0x800CCC69 - Mailbox not found

1. Clear the outbox and recreate a test message.
2. Recheck account information (mail servers and login information). If "my server requires authentication" is ticked, ensure it is set to "use same settings as incoming mail server". Check SSL settings.
3. Recreate the mail account.
4. Disable any antivirus or firewall software.

0x800CCC6A - Error processing request

1. Check for any mail outages.
2. Recheck account information (mail servers and login information). If "my server requires authentication" is ticked, ensure it is set to "use same settings as incoming mail server". Check SSL settings.
3. Recreate the mail account.
4. Disable any antivirus or firewall software.

0x800CCC6B - "User mailbox is known - but mailbox not on this server"

1. Check for any mail outages.

0x800CCC6C - No space to store messages

1. Try sending a smaller message.
2. Check for any mail outages.

0x800CCC6D - Storage limit exceeded

1. Try sending a smaller message.
2. Check for any mail outages.

0x800CCC6E - Invalid mailbox name syntax

1. Check the syntax of all recipients specified in the message.
2. Clear the outbox and recreate a test message.

0x800CCC6F - Transaction failed

1. Clear the outbox and recreate a test message.
2. Check for any mail outages.
3. Recheck account information (mail servers and login information). If "my server requires authentication" is ticked, ensure it is set to "use same settings as incoming mail server". Check SSL settings.
4. Recreate the mail account.
5. Disable any antivirus or firewall software.

0x800CCC78 - Unknown sender (Incorrect Reply-To address)

1. Check the reply-to address specified in Outlook.
2. Recreate the mail account.

0x800CCC79 - Server rejected recipients

1. Powercycle Modem if ADSL
2. Recheck account information (mail servers and login information). If "my server requires authentication" is ticked, ensure it is set to "use same settings as incoming mail server". Check SSL settings.
3. Ensure outgoing mail is not trying to use the Westnet mail server from a non-Westnet connection (the roaming mail server mailr.westnet.com.au will need to be used instead).
4. Clear the outbox and recreate a test message.
5. Recreate the mail account.
6. If the affected email address is on a Westnet hosted domain, do a DNS lookup, to verify that the domain has not expired.

0x800CCC7A - No sender address specified

1. Check the reply-to address specified in Outlook.
2. Recreate the mail account.

0x800CCC7B - No recipients specified

1. Ensure at least one recipient has been specified in the message.
2. Clear the outbox and recreate a test message.