Could you please add the ability to reject emails that pretend to be in the domain but are not in the IP range of that domain ?
How should opendkim determine "in the IP range of that domain"? SPF? InternalHosts? Keep in mind that opendkim can sign for multiple domains.
What about clients that authenticate using SMTP AUTH? What about the MTA name and macro checks, which are already supported?
Overall, I don't believe this is something opendkim should be doing, as it's not a DKIM-specific function. But we can figure out what to do after you fill in the above blanks.
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