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How can I configure Postfix to relay emails addressed to particular domains through a separate SMTP relay

cn flag

I have a few domains that won't accept emails from my ip address, regardless of anything I've tried (submitting requests to whitelist, etc). These are transactional emails for customers of an e-commerce site - I've gotten almost all services to whitelist the ip. The biggest offender is icloud.

I'd like postfix to use a dedicated SMTP host (like Mailgun, etc.) to relay only mail that's addressed to users at those domains.

I get how to set up a transport map for sending domains, but how would I do this for a recipient domain?

mangohost

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