I am running into the same difficulties as what is described in this post from 2020. CC does not allow for more than one DKIM key within the account settings / authentication section. I have two different domains that I want to be able to send email campaigns from and my verified sending email address' are a mix of those two domains. A second account - just for that other domain - is unreasonable. All I need is the ability to create multiple DKIM keys that save to my account so that my outbound messages can be verified.
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