|I have been informed bu a friend of mine thathe has received emails which I have sent even though they were not addressed to him.

Apparently other have had the same thing.

How is this possible?  MSN dont seem to care they just say to me"ask the community"  and dont do a thing themselves.

THis is serious as |I do send sensative information by email and this could cause me and others trouble big time.          How can I stop this happening?   I believe myself its something to do with Live Messenger, dont know why but I do.     Can I dump all my live messenger contacts without losing them from my live email  account?

{removed email address}

Please don't think that we don't care about you guys. This site is available for your concerns.

For me to help you on determining the cause of this issue, can you ask your friend to send you a copy of the e-mail that he/she received from you with its full headers exposed? If you can and once received, post those information here for me to check them out.

For your messenger concerns, you have to contact the Windows Live Messenger Technical Support Team. Refer to our Solution article below for their help link:
 
http://windowslivehelp.com/solutions/newvisitor/archive/2009/02/04/how-to-get-support-for-your-non-hotmail-products.aspx
 
To contact their team, follow these steps:

1. From their Help page, click the version of Windows Live Messenger that you're using.
2. Select one of the help topics displayed under the search box. 
3. Click Get more help at the lower-right corner of the window then click Get support. 
4. Complete the e-form and then click Submit.

Note: I've moved your post to the Mail Delivery forum because this is the appropriate one for it.