OK, I realize now why people are confused. Thanks for helping me understnd, guys. When the Proxy inserts the DKIM header, it uses the domain in the sender's name, not the domain in the hostname of the UTM. There is only one DKIM key per UTM and that's all that's needed. Just because I used the "main" domain name doesn't mean that the private and public keys contain or reveal any information about a specific domain. In my instructions, I was thinking about how to keep DKIMs straight for multiple clients. That's why I chose the naming convention I did. You can name them whatever you want, like privatedkim and publicdkim, and then use the public key contents for a DNS record in every domain you send for. I'll see if I can get the KB article changed to remove confusion. Cheers - Bob
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