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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...