Email via SMTP, POP3 is in plain text. So as it flies from your internet mail server to your machine, any human armed with a PACKET SNIFFER can read your email.
Nothing new here. I think back in 1998 I demo'd this. Remember that you should treat email like a POST CARD. Anyone can read it.
I think someone has installed email monitoring/spying software on my laptop while I was not in the room and while my laptop was running and logged-on. This person once told me they had such software, and now I am fairly sure my emails are being spied on (though not on my laptop).
Which products are best at detecting and removing such malware?
My norton security s/w and webroot do not detect anything suspicious.
I have done considerable google'ing on this issue without finding any product that is good at this specific threat.