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

Updating Outlook SSL Certificate

You may want to install SSL for your email or update an existing certificate you had installed...

503 valid RCPT command must precede DATA

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

Outlook: Unable to logon to the server using Secure Password Authentication

Outlook Express is setup to use Secure Password Authentication. Go to 'Tools' -> 'Accounts...'...

IP Address Has Changed! Error When Using Webmail

The error IP Address Has Changed can occur in cPanel and its webmail if your IP addresses changes...

Outlook: Error 0x800C013B When You Attempt to Send a Message

When you try to send a message in Outlook Express, you may receive the following error message:...