I wonder how we could describe this so that aging non-technical executives understand.
"It's like your real salesperson showed up in a wrinkled suit smelling of booze, telling me that your product could be seen in the back of an anonymous white van... But only if I first proved I was carrying the asking-price in the form of gift-cards."
I would simplify the message a bunch, things like capitalization and even the currency issue, detract from the core issue.
"There are technologies and protocols from the early 2000s that need to be followed to ensure that a a message comes from your company, they are not being followed so messages requesting payment are indistinguishable from impersonators.
The protocols are called DNS and HTTPS, the cost to implement for the country in question would be in the 5 digits range, the benefits would be massively detracting scammers from targetting your company to impersonate and thus harm your brand."
I don't think metaphors help, non technical people, especially executives, can handle minimal technical details.
"It's like your real salesperson showed up in a wrinkled suit smelling of booze, telling me that your product could be seen in the back of an anonymous white van... But only if I first proved I was carrying the asking-price in the form of gift-cards."