Whether it's your outgoing spam filter that's overzealous, or if a datacenter is on fire is irrelevant. Your infrastructure stopped doing what your docs said it would.
Paying customers like myself have apps running on your infrastructure. Your infrastructure stopped delivering the exact same emails that it had been delivering for years. It did this without notification and without triggering any errors.
Approximately 35 quote requests that should have been delivered have disappeared into thin air. You've cost me money, and I'm disappointed to find out that you'd been notified of this issue weeks before it began affecting me.