That said, if the test email bounces, that might be required to start the countdown anyway?
I have very little expectation that the boneheads who came up with this scheme considered this possibility, and therefore exempted test e-mails from the bounce-trigger requirement.
The imaginary black-hat that hangs out on my left shoulder has already suggested that spoofing a bounce message for a correctly delivered registered e-mail could be used for mischief. Phishing the domain customers is entirely too obvious for him, though the imaginary white-hat that hangs out on my right shoulder seems quite concerned about it. They both agree that black-hat wins this round.