Is it possible to track which emails are / have been sent on behalf of my domain by an authorized external server via SPF?
I have DMARC enabled and would like to monitor what external domains are sending, since I don't have direct access to them.
Is it possible to track which emails are / have been sent on behalf of my domain by an authorized external server via SPF?
I have DMARC enabled and would like to monitor what external domains are sending, since I don't have direct access to them.
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Yes, you absolutely can but the problem is that DMARC reports are notoriously hard to read without some sort of tools such as dmarcian, Agari, or some other service that provides a user-friendly interface to read the data.
If your visible from is example.com and em.foo.com (an external domain)is the SMTP FROM domain then that's what I think you're looking for. DMARC reports for sure provide this data. The trick is getting these daily XML reports sent to a service that can present these reports in a readable way.
If you don't want to pay for a service such as DMARCIAN there are free and open-source DMARC software you can find on GitHub and elsewhere.