Thanks all for replays. Just few remarks:
1. RDNS - e.g. for den...@bestcheer.com, li...@dguhl.org, ... that's what I had try to correct with myhostname = 108.234.broadband4.iol.cz yes - it is what I get with dig -x <my public IP>, so then dig 108.234.broadband4.iol.cz == this address. So reverse DNS lookup check should be passed - I hope. But how answered by most - in my case it can not help, because I have only personal (from dynamic range) homeuser-IP - no "business" account. So I can nothing to do with it (in Postfix) config - just to degrade Postfix with "relayhost" to my ISP SMTP server - what is exactly what I have did not want. 2 . for Andreas - lst_ho...@kwsoft.de the link http://mail.google.com/support/bin/answer.py?answer=10336 works for you ?! Thanks to all --kapetr
