From: Alex van den Bogaerdt (alexergens.op.het.net)
Date: Wed May 21 2003 - 19:15:47 CDT

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On Thu, May 22, 2003 at 11:40:19AM +1200, Johnno wrote:
> Hello,
>
> I am running two postfix servers one as the main the 2nd as a backup..
>
> The question is on the 2nd postfix machine (backup server) do I need to put
> in the user accounts like I have done with the main postfix server?

If you allow everything to come in on your backup server, forward it
to your primary server and _then_ find out the recipient does not
exist, you are responsible for sending the bounce.

Now if all senders would really exist and if all of those existing
senders would really have sent the message, there's no big problem.

In reality there are two problems:

1) You will be getting a lot of mail being stuck in the queue for
   some time, as it cannot be bounced to a non-existing "sender"
2) You will be bouncing mail to people not having sent the message
   at all

If possible, reject the mail right at the front door. You do have
access to a list of user accounts so yes, do copy that to the backup.

cheers,
Alex

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