I absolutely do not understand how you believe trusting an individual on the internet creating a fly-by-night service is better than trusting a company with 20-years in the industry, and GMail a product that has been around for 15-years.

You're hosting all of this on a single machine -- with no redundancy -- with no DDoS protection -- and it makes me seriously doubt your sysops and opsec skills to be able to deliver a secure and reliable product to your customer.

;; ADDITIONAL SECTION: box.normail.co. 3464 IN A 178.62.214.105 ns1.box.normail.co. 3430 IN A 178.62.214.105 ns2.box.normail.co. 3430 IN A 178.62.214.105

If you are wishing to achieve your objective of moving people off Google, you should be suggesting a provider that _does_ have the infrastructure to provide a reliable service, that is a reputable organization with a proven track record for good sysops and opsec, and is an alternative to Google.

The most important part about e-mail is longevity. It is making sure your emails can not be read by malicious actors. It is making sure your email is never down. For many people it is the absolute backbone of their business and maybe their life. I absolutely would never put this much trust in a service like this. It is preying on ignorant paranoid people with impaired risk analysis who (like you) believe Google is the devil.