Am 08.06.2017, 09:58 Uhr, schrieb AZ.________ eine E-Mail an die E-Mail-Adressen [des Privatklägers] und [des Beschuldigten] (pag. 1148): « Dear Mr A.________, good morning. I'm coming back to
our telephone call yesterday and the quote, we've sent you via mail. […] You told me on phone, that
you nevertheless want us to go on with the investigations, to do EDXRF measurements and sampling
before your meeting with Mr BE.________. Thus I want to indicate again to our conditions, mentioned
in the offer, this means payment in advance (We have pointed out this condition already in the first
investigation step last year, you've payed a small partial payment, for the rest we had to ask for three