> All mailing list forward mail with the original sender in the
> enveloppe 

Not true: Mails from the swinog-mailinglist reach my mailserver with
[EMAIL PROTECTED] as sender envelope address

> and if you forward your mail on one server to another one
> with e.g. a simple .forward rule it will also re-use the same
> envelope from address. Forwarding mail is very common and it is
> important to use the same envelope form address in the forwarding
> path. Everybody who denies this fact does not understand the email
> system and the way bounces work.

If you chose to forward mail this way, then you'd better make sure that
the destination mail server doesn't apply spf checks for mails coming
from the relaying server. or that the forwarding server rewrites the
sender address. 

If you're a provider that allows its users to forward their mail to
remote addresses, then I'd advise you to use sender rewriting and thus
offer your customers a reliable mail relaying. That's a marketing
argument. 


But in the end, everyone can do whatever they want to do ;-)

Jean-Pierre

-- 
HILOTEC Engineering + Consulting AG - Langnau im Emmental
Energietechnik und Datensysteme: Server, PCs, Linux, Telefonanlagen, 
VOIP, Hosting, Datenbanken, Entwicklung, Komplettlösungen für KMUs
Tel: +41 34 402 74 00 - http://www.hilotec.com/
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