Is my.dot.tk Safe?

my.dot.tk was recommended to me for making gratis aliasses to avoid spam. My friend had good experience with my.dot.tk The strange thing is that my.dot.tk mentions sites in regard of a gratis domain name: ***** and ***** If I try out these domains, you are referred to ***** which is a dangerous domain according to WOT. So I wonder how trustworthy my.dot.tk is... I have not yet enough experience to make rating.