Outlook Error 0x800CCC0F – How to Fix It

One of the common problems of failed email delivery in Outlook is caused by a failed client-server connection. Below, check the most common reasons why Outlook error 0x800CCC0F occurs and how to fix it successfully.

1. recipient’s IP is blocked

The main reason for this error is that the recipient’s IP is logged on the cPanel server’s firewall. The block occurs due to too many failed connections, simultaneous POP requests to connect from the recipient’s IP address, or a website update that triggers mod_security.

For more information on why an IP address is blocked, see My IP address is blocked. How do I unblock it?

2. The antivirus program blocks the connection

If the recipient’s IP is not blocked at server level, the problem may lie with the antivirus program on the recipient’s computer. The recipient should turn off the antivirus for a while and try to receive the email again.

3. Firewall settings

Just like an antivirus program, a firewall can block the recipient from receiving emails. If the Outlook priorities are set incorrectly or if no SMTP port (e.g. 587) is added to the firewall, error 0x800CCC0F may occur. The recipient should turn off the firewall for a while and try to receive the email again.

4. Invalid e-mail recipient

Outlook error 0x800CCC0F may cause a situation where sending outgoing mail is blocked. This may be due to a specific message having an invalid recipient, which prevents other emails from being sent successfully.

The problem requires the deletion of the e-mail message that caused the Outlook error to occur, thus ensuring that the e-mail client functions smoothly again.

5. Corrupt Outlook profile

In some, rare cases, a problem may occur in the Outlook profile. If none of the above three scenarios resolve the issue, try to re-add the Outlook account or repair the Outlook PST file using the “Microsoft PST repair tool“.

For further assistance you can call us on 059 335 000 or email us at info@neoserv.si.