From: Alexander Pertsch (alexander.pertschblue-elephant-systems.com)
Date: Mon Nov 28 2005 - 09:19:22 CST

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Am Montag, den 28.11.2005, 10:02 -0500 schrieb Wietse Venema:
> Alexander Pertsch:
> > Hello,
> >
> > for building an internal email server, I've installed postfix and cyrus.
> > Now I tried to configure postfix to use cyrus for mail delivery and in
> > case that cyrus does not know the user, I want postfix to forward the
> > mail to another smtp relay host.
> >
> > Is this possible with Postfix? I saw a posting from 2001 when this was
> > not possible. Is there now a solution for this problem?
> >
> > All locally known users are saved in a ldap database, so perhaps this
> > could be used as another approach to a solution?
>
> Do not accept mail for unknown users.
>
> Your Postfix server will be flooded with spam and viruses for random
> email addresses, and it will send all that email back to to innocent
> people when it turns out to be undeliverable.
>
> Wietse

Thanks for your reply, sorry I was not exact enough:

I don't want to generally accept mail for unknown users. The problem is
that we have another smtp server running that handles email addresses
for addresses on your domain for users not on our local site.

So if a user from our site sends an Email to another user on our domain
that is not known to our server, the server will forward the mail to
this other server. The server is not accessible from the internet, only
for local users with user verification.

Best regards

Alexander

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