Hi.

I'm running postfix-20010228-20mdk on a Mandrake Linux server.

On this server, I'd like to setup postfix in such a way, that it relays
mails if the senders From is from certain domains. However, postfix
itself will not be an MX for these domains and the sender will also not
always be on a certain IP.

How could I do that and how risky is this in terms of being an open
relay? I understand that this will open some risks, but then again a
spammer would also need to know which domains I allow relaying for.

Thanks,

Alexander Skwar

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