Philip Hanson, who owned Ionics way before Ionics was as big as it is now, used to post on this forum regularly. He always seemed a very approachable person.
I cannot see Ionics being bothered enough to send any type of email, and especially an abusive one. Why would Ionics link themselves to such gutter tactics? I'm certain if it was Ionics, it would be better written and in easy to understand English and not in that crappy way of writing.
It has to be from somewhere else.