[talrodil]

it doesn't make any sense for them to block reply and people have to start another inquiry for the same thing. Maybe it's something temporary or they do it to a particular location or mail server

Sense? No this is idiotic. Amz CS has lost the plot, or they're banning Gmail addresses. Maybe they have an issue with Google or Gmail is a common source of fraud. Just ignore the annoying customer request and make it go away, right?

Regardless, this is what happened and what worked.