I don't like GitHub's security screener dismissing this report because of the "social engineering" aspect. There is a real problem here; it's easy to imagine this disclosure leading to another major OSS supply chain incident. I hope GitHub security folks are taking this more seriously than indicated by the response to the researcher.

> Their response seemed to indicate that the account was flagged due to previous issues sending emails, which would be expected with the domain having expired.

It's entirely possible that the domain could have been re-registered long before their next attempt to send an email to it.

I wonder if it's safer (and plausible) to run a daily whois audit job for all maintainer email domains and block anything that enters the redemptionPeriod status?