If I am understanding correctly, administrators and users want to receive emails for content, so you have SMTP configured, but you want the particularly administrative emails to be sent elsewhere (i.e. to a dedicated email address).
Yes - sounds like you've understood this.
In our case, we don't actually want the email for content either (we have existing systems for scheduling and sending)... but I understand we're unusual in that use case.
Is there another channel that that information would be useful on? I.e. in logging / structured logging?
Yes - logging also useful. Think I've already commented/requested in other places, that we'd love to see the logging structures changed to make them more Splunk parsable