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Email client error codes

Review specific email client error codes and instructions to troubleshoot them.

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Troubleshoot email client errors

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Troubleshoot error codes

Common email client error codes

Many common email errors are caused by incorrect email client settings. View the list below for more information.

Note: If you are troubleshooting and can’t access your email program, you can use your currently.com email account to send and receive email in the meantime.


Common email error codes
For error code(s)Follow these instructions
0x800CCC0D

0x800CCC15

0x800CCC67 (affects outgoing email only)
If you are getting any of these errors, we suggest trying the following troubleshooting tips:
  • Make sure you can browse the Internet. If you can view webpages but you can't send mail, you may have the wrong mail server typed in your account or the server may be down.
  • Verify your email client settings. Verify your settings to make sure they are correct.
  • Check for stuck email. In your email program (i.e., Outlook Express, Outlook, etc.), look to see if you have any messages in your Outbox folder. If so, remove those messages and try to send a new message.
  • Temporarily disable your firewall. To disable a software firewall on a Microsoft Windows operating system, find the icon for your firewall on your taskbar (near the clock). Right-click on it and select disable. Try sending/receiving email. If it works with your firewall disabled, you may need to adjust some settings in your firewall. For assistance, refer to your firewall manufacturer's support documentation.
  • Temporarily disable your anti-virus software. To disable most anti-virus software on a Microsoft Windows operating system, find the icon for your anti-virus on your taskbar (near the clock). Right-click on it and select Disable. Try sending/receiving email. If it works with your anti-virus disabled, you may need to adjust some settings in your anti-virus. For assistance, refer to your anti-virus manufacturer's support documentation.
  • Reboot your computer and try again. If you still can't access your email but you have an Internet connection, you can use your currently.com email account to send and receive email in the meantime.
0x800CCC0E“The connection to the server has failed. Account: 'account name', Server: SMTP.att.yahoo.com, Protocol: SMTP, Port: 25, Secure(SSL): NO, Socket error: 10061”

Cause: AT&T has blocked port 25 for U-verse customers. Filtering port 25 cuts down the amount of spamming and viruses sent unknowingly by computers already infected by viruses, as a single infected computer can send millions of email messages in only a few hours. This is a proactive effort by AT&T to alleviate customer complaints regarding receiving spam or a virus through email.
  • Verify your email client settings.
  • If you still can't access your email program but you have an Internet connection, you can use your currently.com email account to send and receive email in the meantime.
0x800CCC19Refer to the troubleshooting tips at the beginning of this table. In addition, do the following:
  • Check for a large email. If such exists, this could be causing the program to timeout while trying to download it. Delete the email and retry.
  • Check for stuck email. See if there are large emails saved in the inbox. You can either delete the emails or have them transferred to a different folder.
  • Check if the attachment that you are sending is equal or larger than 25Mb. We suggest you downsize the file you are trying to send either by saving it as a different file format (for pictures) or by using a third-party program that could compress files.
  • Move large files out of your inbox. If an email in your inbox is greater than 25MB, move it out of your inbox into another folder.
  • Reboot your computer and try again.
0x800CCC90If you are getting the error 0x800CCC90 POP3 Response Error: Client response invalid:
  • Refer to the troubleshooting tips at the beginning of this table
  • Delete and recreate the account in your email program, making sure the settings are correct.
  • Reboot your computer and try again.
  • If these steps didn't work, contact the manufacturer of your email program for more help. If you still can't access your email but you have an Internet connection, you can use your currently.com email account to send and receive email in the meantime.
0x800CCC92If you are getting the error 0x800CCC92 POP3 Invalid Password: Password not valid for account:
  • Check your Outlook Express settings, and make sure your username and password are correct.
  • Reset password to a different password and verify the ability to check email.
  • Recreate your email account in Outlook Express.
0x800CCC78The full text of this error message will generally look something like this: “The message could not be sent because the server rejected the sender's email address. The sender's email address was (Email address). Subject (Subject), Account: (Account name), Server: (Server name), Protocol: SMTP, Server Response: '505 Authentication required', Port: 25, Secure(SSL): No, Server Error: 505, Error Number: 0x800CCC78.”

This error message means the SMTP server authentication feature is disabled in your email client. Check your email settings and enable this feature.
0x800CCC91If you are getting the error 0x800CCC91 POP3 Invalid Username: Invalid username or username not found:
  • Re-type and verify the username and password in the mail profile.
  • If the error persists, it is caused by your anti-virus program settings. Change your anti-virus program so it does not scan all emails automatically.
0x80042108Refer to the troubleshooting tips at the beginning of this table. If these steps do not work, there is likely an issue with your anti-virus software. Contact the manufacturer of your software for help.
0x8004210ARefer to the first four troubleshooting tips at the beginning of this table.
0x8004210BRefer to the troubleshooting tips at the beginning of this table. If you are using Outlook 2002, you will need to have Service Pack 3 installed. You can go to Microsoft’s website to get the latest Service Pack for Outlook. Please contact Microsoft if you need help with this.
0x800CCC0BMake sure you're only checking your email on one computer/device. Then, refer to the troubleshooting tips at the beginning of this table.
0x800CCC95Verify your email client settings. If these steps do not work, try to delete and recreate your email account.

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Additional steps

Verify your email client server settings 
Check your email client settings to make sure you have the correct information.

AT&T ConnecTech
If your computer problems continue, try AT&T ConnecTech®, our fee-based support.
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