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The registrar can’t really do anything, and the service they use to receive email (what you’d see in the DNS MX record) is often totally different to the service used to send marketing emails. You’d need to look at the
Received
headers of the email to figure out where it was sent from. For example, a lot of companies use Office 365 or G Suite for corporate emails, but something like Mailchimp or ConstantContact for marketing emails.So, here’s my reasoning -
Inspecting the headers will let you see where the email came from - if it came from MailChimp, then you email the MailChimp abuse folks, who can apply their abuse policies. And the DNS registrar has the keys to the kingdom. Many registrars have terms of service that forbid using their service for spamming. That ought to include emails associated with the domain, no?
In the end, there’s a high likelihood of no real action being taken (not without a volume of complaints), but if the righteous wrath feels righteous, do its outcomes have to be righteous?