Outlook: Error Message: 0x800CCC0B

First try restarting your computer. If the error persists try removing the mail account from your mail client, close it, and re-add it.

Email Configuration Tutorials

You will also want to make sure your Internet Service Provider is not blocking port 25 access outside their own service. By opening a shell/command prompt and typing "telnet mail.yourdomain.com 25" you should be able to reach it. If not, your ISP or software you have installed is blocking your access.

Now as an available option you may use port 50 as an alternative port for sending mail via SMTP.
  • 535 Users Found This Useful

Was this answer helpful?

Related Articles

Why aren't my sent emails showing up in my sent folder?

Often when we setup our iPhones and iPads we do not complete the process to truely map the phone...

Can I add and create email addresses or add aliases?

In the control panel go to Mail. There you can create email accounts, remove, read (webmail, add...

An error has occurred

When you attempt to send and receive messages, the operation is unsuccessful, and you may...

Is port 587 available for email sending?

Yes, port 587 is available for SMTP sending with or without TLS/SSL.

Unroutable mail domain

This can occur for several reasons. Make sure you have the proper spelling of the email...