No-one can stop people "spoofing" your email address: even I could send messages that appears as though they were from you it with my home setup if I knew what your email address was. The problem is that I can't receive any email from this address. People spoof millions of email addresses (especially Hotmail accounts), it is all part of spam. The best advice is to create a Hotmail account with a very unlikely/uncommon/unusual name that no-one would think to spoof. For example
[email protected] would unlikely to be spoofed.