Hello, I HAVE TO apologize me :-)
I had present my solution with stunnel4- and now I see (as wrote by <r...@gmx.co.uk> - thanks) it is in http://www.postfix.org/TLS_README.html#client_smtps. So it shows again the Great Truth - RTFM! Sorry. So at least I also see, that this is normal solution with Postfix. --kapetr
