I’m considering using KumoMTA as the backend for a client who will basically run multiple customers under them. Basically, they want to be a private-label ESP.
My question is if it’s possible to “dual-sign” with the DKIM. Essentially the “ESP” signs first, then the customer signs on top of that (with their DKIM aligned for DMARC, etc)
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It’s possible, and available pre-built with the DKIM helper, which even lets you decide whether you want the ESP signature always, or only if the customer signature isn’t present.
Why would I even question, I actually assumed you had it but wanted to make sure before I dug deeper into it
Not our first rodeo. 