Professional and professional

I must say it to my German colleague.
They find out my first email in 1 Feb and keep on use it. For one topic he first find all the information he need from me, then based on what I say begin to talk with my boss and directors.
All what I wrote finally was shown on the email to my boss and directors
Well, remember that:
What you write down on emails could be exposed like this, so careful!
One topic, many emails, but always keep all the historic emails in it.