On 2009-09-15 Dan Slay wrote:
> I'm looking for some information on preventing the sending of
> backscatter from a Postfix gateway mail server.
> 
> The server itself does not and will not hold a recipient list,

Then you can't avoid sending backscatter. Period. RFC 2821 clearly
states:

| If an SMTP server has accepted the task of relaying the mail and
| later finds that the destination is incorrect or that the mail
| cannot be delivered for some other reason, then it MUST construct
| an "undeliverable mail" notification message and send it to the
| originator of the undeliverable mail

> therefore I don't know what the best way forward would be?

Maintain a recipient list.

Regards
Ansgar Wiechers
-- 
"Abstractions save us time working, but they don't save us time learning."
--Joel Spolsky

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