>From: "Theodore Y. Ts'o" <[log in to unmask]>
>   From: "C. Harald Koch" <[log in to unmask]>
>
>   This is my last word on the subject. After all, the only legitimate recourse
>   I have is to recommend that my correspondents switch to other, less
>   draconian, service providers, and I've already done that.
>
>Actually, you have another recourse, which is to fix your mailers to
>follow RFC 1123's statement that mailers SHOULD NOT create an RFC-822
>header containing an address with an explicit source route.....

   MAIL FROM: is _not_ the part of header and can be seen the only
in Return-Path: header line.

                                        - Leonid Yegoshin, LY22