If you have a high volume email inbox (role-based address), neither G Suit nor fastmail will suffice. Or they will, but you'll live in fear of a super high volume day when you get blocked, or start dropping messages.

This critique is for inbound mail for DAQ, not outbound mail (spam).

Does anyone know if G Suite, Fastmail or others offer a high volume option? receive 10K or more messages per day?