I am A Student at University and am unable to send any emails from my talktalk account while I can receive without any trouble.

This error appears within about 1 sec of me pressing 'send and receive':

Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity.

Subject: [Subject]
Server: 'smtp.talktalk.net'
Windows Live Mail Error ID: 0x800CCC0F
Protocol: SMTP
Port: 587
Secure(SSL): Yes
Socket Error: 10053

I have tried changing the port and unticking/ticking this requires secure connection and have tried disabling my firewall.

I am 99% sure it is related to the University's Servers and not my Laptop.

Any help would be greatly appreciated