Can you fix my email setup without breaking my live store?

Yes, that’s the whole point of our process. Email and DNS changes are reversible and low-risk when done in the right order: we capture the current config first, test changes against sandbox addresses, publish DNS records with sensible TTLs, and only switch the live queue back on after a verified test send. Nothing about an email fix touches your catalog, checkout, or order data, so there’s no risk to live transactions.