Solution: Change POP mail server and Port for Microsoft Hotmail Servers.
/* Update at Feb 18, 2010: Change SMTP sever and Port if "Negative Vibes" message shows off when sending out emails with Hotmail servers.*/
You can get initial idea from 1 google group. "http://groups.google.ca/group/thunderbird-webmail-extension/browse_thread/thread/21bec8b55185fb5e", but it doesn’t provide any clear idea as above 2 images.