It's not unusual to have your mail server serve multiple domains. However, each domain has it's own unique settings eg spf records etc.
Although the UTM supports DKIM, the RSA key for each domain will be different so I'm wondering how to set this in the UTM? I can set it for one domain but can't find a way to set it for multiple domains as DKIM only shows under the advanced tab and not the smtp profiles.
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