its like the first:

end-user client -> microsoft server -> postfix server -> remote recipient

Am Sonntag, 16. Juni 2019 schrieb Wietse Venema <wie...@porcupine.org>:
> Stefan Bauer:
>> our users send/receive via o365. the last mile o365->recipient should go
>> through our service like o365->postfix->recipient
>
> Dumb question: is the mail flow like this:
>
> end-user client -> microsoft server -> postfix server -> remote recipient
>
> Or is it something else?
> - Local recipient?
> - End-user office 365 client -> postfix server?
>
> Please be explicit about the client and server roles.
>
>         Wietse
>

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