Dnia  6.05.2021 o godz. 14:07:55 Vytenis Adm pisze:
> 
> Yes, we did look into it, and it's not an option. "transport_maps"
> looks into a DB, and we can't rely on it. Clients can point MX to
> their own servers, and "transport_maps" will route to our MX
> regardless of what is set in customer's DNS.

"transport_maps" looks into a *map*, and a map in Postfix is more than just
DB. For example it can be a *TCP table*, which means Postfix is asking some
program that listens on a specific port for the key, and gets a value in
return. It is described here: http://www.postfix.org/tcp_table.5.html

Seems like this can be a solution for you. You have of course to write the
appropriate program that replies with the correct server address depending
on recipient's email adress.
-- 
Regards,
   Jaroslaw Rafa
   r...@rafa.eu.org
--
"In a million years, when kids go to school, they're gonna know: once there
was a Hushpuppy, and she lived with her daddy in the Bathtub."

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