[yatac42]

> My takeaway is that his test email bounced

What test email? I see no mention of a test email in the blog post. The mail that bounced was the one with the verification link from Viva.

[that_guy_iain]

So you think he had access to Viva's email servers to see the response? No, he clearly tested it himself and used his credentials to send it.

[bn-usd-mistake]

The log line is from Google Workspace which exposes it to its customers for incoming mail