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postfix auth for relay from second server

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Jan Novak

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Nov 15, 2017, 8:32:48 AM11/15/17
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Hi,

i have a postfix (A) as proxy in front of the real postfix (B) server
with users there.
The A Server is delegating some domains to the B one and some domains to
an outsided mail server (C).

For relaying mails to "B" i need to auth the users at "A" <-- "B".
Or in other words:
The "A" Server must use the database/backend on server "B" to relay
mails to "B".
For Info: "B" sends mails out directly into the internet (not through "A").

How can i realize that?

Jan
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