Same here. Because you use a DKIM generator (and lets face it, most will), it gives you the impression that it's tied to a domain name. It is to a degree (with the generator) because the generator will use that string to make the key and as we have discovered, making a DKIM key with 3 different domain names will result in 3 different DKIM keys But you can use any of those keys with any of your domains as long as the private key matches up with the public key. So back to the original question: 1. generate your ONE private & public DKIM key (tied to any domain you like or even a non existent one) 2. place the private key in the UTM 3. place the public key into EVERY domain dns that you manage on the UTM
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