ons, 31.03.2004 kl. 13.05 skrev Jamie L. Penman-Smithson:

> Throwing about hysterical comments such as this, is not particularly
> helpful. You can *already* change your email address to whatever you
> want, you can pretend to be the Prime Minister of Mongolia, such is the
> nature of the SMTP protocol. You can even do this (*shock* *horror*) in
> Evolution already - change your From address to whatever you please.

I don't want to attack - please see the From: address that I use; I
often use VERP myself (after 2004-04-08 this address will be invalid and
my mail server will reject mail to it).

However, whilst it might be possible to enter any From: address in mail
sent from MTAs that I install and maintain, it isn't possible at all to
send any mail without authenticating with a user name and a password.
This user name is then used in the envelope sender dialog with the MTA
(EHLO/MAIL FROM:/RCPT TO:/DATA). If the authenticated user then tries to
use  any other MAIL FROM:, the server won't let him. I'll always know
which of my users sent which mail to whom from my servers - this is a
recent Postfix smtp AUTH jail. Simply because I won't tolerate forgers
or spammers on my patches.

--Tonni 

-- 

mail: billy - at - billy.demon.nl
http://www.billy.demon.nl

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