Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity. Account: 'pop3.telus.net', Server: 'pop.telus.net', Protocol: POP3, Server Response: '+OK message follows', Port: 110, Secure(SSL): No, Error Number: 0x800CCC0F

When you use Microsoft Outlook Express to send and receive mail to a Post Office Protocol 3 (POP3) or Internet Message Access Protocol (IMAP) server running Exchange 2000 Server or Exchange Server 2003, you may receive the following error message. Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity.

Reminder:
Email always have limitation try to compress the file using zip or rar it help you to reduce the size of your video file
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You must allow your router access to send out mail. other wise it will keep the messages you send in the outbox. go to your router setup or type your router ip address in the internet browser and manually enable the port 465 you may have to goto applications and games tab if you have a linksys router. Also enable ports 80 for internet,25 for simplemail transport protocol (SMTP),110(e-mail),443secure (bank account information) this will allow the router the proper ablity to send and recieve e-mails.

Who is your ISP? Is your Outlook Express correctly configured? Make sure your servers are correctly defined, ie for Comcast it might use mail.comcast.net for incoming, and smtp.comcast.net for sending. Your ISP has these server names they can give you.

Sounds like you took your work computer home to do some work and its looking to connect to the company server to get your credentials to give you access to the system and files.

I would guess you need the VPN connection to connect to the server its looking for.
From what info you provided that's all we can tell you.

Please look at this site it might help, http://support.microsoft.com/kb/813514, best regards

The most common causes of these error messages are problems with Internet connectivity and account settings configured incorrectly in Outlook or Outlook Express.

Perform the following methods in order. If one method does not resolve the issue, move on to the next one. The methods are as follows:

Method 1: Start Outlook in safe mode
Method 2: Create a new e-mail profile
Method 3: Delete suspicious messages from your mailbox
Method 4: Check your antivirus vendor’s Web site for additional suggestions
Method 5: Remove, and then reinstall Outlook Express
Method 6: Verify that all SMTP e-mail addresses in a distribution list are valid
Method 7: Examine the configuration of your firewall software

If your antivirus solution includes an e-mail scanning feature, you may have to perform additional configuration tasks to use Outlook or Outlook Express with the antivirus e-mail scanning feature.

Antivirus software that is known to have caused this problem includes products by the following vendors:

• Symantec (Norton)
• McAfee
• Trend Micro (PC-cillin)
• Panda

the message could not be sent because it rejected as the sender

Incorrect account settings.Remove your account and create new one in outlook.Check if u have installed any antivirus or firewall program blocking this.

Reconnect to server or restart pc OR investigate stuck email on outbox or try to disable firewalls or antivirus as well