Error: 0x800CCC0B

----> Needs to check 'My Server Requires Authentication' in Outlook Express.
Another alternative Solution :
----> This error message is caused by either a firewall blocking port 25 or your ISP blocking port 25. Port 25 is used to send your email. Steps to fix: 1. Check and make sure port 25 is opened in your firewall configuration. 2. Check with your ISP to see if they are blocking port 25.