After hours of trial and research, I was able to do that.
So we'll not use relayhost= and we'll use this instead:
default_transport = relay:[smarthosthere]:25
instead of sender_dependent_relayhost_maps, we'll use this:
sender_dependent_default_transport_maps = hash:/etc/postfix/transport...
Hello,
I've spent my all day trying to achieve this, with no success.
Here is the deal:
We use PMG as outgoing mail gateway. Permitted networks can relay mail to PMG, PMG filters these mails and then relays the mail to a smarthost.
There are thousands of sender domains, which is why we use...
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