(real sender email is in Return-Path, but users see only "from"!!!!) What can i fix it?
You can't. The From header is set by the sender's email program, and the Return-Path is typically set from the SMTP envelope of the message. If the From isn't correct, then it's the fault of the sender.
-- Tom Collins [EMAIL PROTECTED] http://sniffter.com/ - info on the Sniffter hand-held Network Tester