Hello Dr. Leela
There is a software (free shareware) known as Mailwasher. I downloaded it two weeks ago but never got to use it as didn't get spare time to configure it yet
You can give it a try.
www.mailwasher.net.
I am sure you must have a firewall in your PC (an absolute must), if not, I can recommend one of the best and free,
www.kerio.com.
Regards.