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?
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?