How do I define the outbound routing through different "virtual MTAs"?

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1

Hi all, how do I define the outbound routing? By that I mean, when injecting into 127.0.0.1:2525,

I want message sent on behalf of company A to blast through out1.companya.com IP 12.34.56.78

…and messages sent on behalf of company B to blast through out1.companyb.com via IP 87.65.43.21

I want these different identities to be “islands” that have no overlap, nothing to do with each other (as far as the outside world knows). How do I accomplish this if Kumo gives me only one “injection point” at 127.0.0.1:2525 in this case?

Is this “Tenants”? Can someone point me to a straightforward tutorial that explains this (not too uncommon) use case?

I was told there is splitting by headers (i.e. inject a magic header that will make the message route through one of the outbound “identities”, and then the header gets deleted before it gets sent)?

3

The standard tutorial at https://docs.kumomta.com covers this.