I don't think it's spyware because I have scaned many times my computer.
I think it has to do somethingwith the ports.

I know these email are old and they are not opt in, but that's all I have!
I got them froma link I found here in the forum.

I would like to use a web based solution but they are not free. That's why I tried to send from my desktop.
The only free service I found is Zokoda but they don't allow to import a list.