[kunwon1]

To echo the other reply, I don't rely on email for critical comms.

If I had to rely on email for critical comms, I would use a product that lets me see the SMTP logs, and alert on failures. I would have some backup provider that I could then quickly shift to

But I'm still an on-prem email administrator, so my entire paradigm is pretty much obsolete. I may not be the best source of info in this space