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

Outlook: When Opening Outlook Express Macintosh Edition: An Error Occurred While

When you start Outlook Express for Macintosh, you may receive the following error message: An...

550-not permitted to relay through this server

The error message "550-not permitted to relay through this server" means that the server you...

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...

503 valid RCPT command must precede DATA

When attempting to send email you receive the following message in your mail client software:...

Can I get webmail running on port 80?

Webmail for Horde, Roundcube and Squirrelmail now works over port 80 when using...