Can't send email in Windows Live Mail 2011

  isititis 00:02 15 Mar 2011

Evening all, I recently upgraded to Win 7 Home Premier from XP Home and I am not impressed. When I try to send email using Windows Live Mail 2011 I get the following mesage Your server has unexpectedly terminated the connection. Possible causes for this could be Server problems. network problems or along period of inactivity.
Subject FW: Update on keeping fit.
Server Error. 451
Server Response 451 invalid Smtp line should end with CRLF.
Server '
Windows Live Mail Error ID: 0x800CCC0F
Protocol: SMTP
Port 25
Secure (SSL):No.

Any ideas on how to correct this issue would be most welcome.

  isititis 09:15 18 Mar 2011

Sorry for the delay, and thank you for your input. There were issues with BT Yahoo that had to be addressed first. Resolved box checked.

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