From the FAQ > Occasionally, obscure email servers will block emails sent through us.

Maybe it's good for personal use or as a throwaway email, but it is not good for main business email. Certainly not a replacement for Gmail or Fastmail kinds. Because you expect the email service to have 24/7 availability and near-perfect email delivery and receiving.

> It's a one-man enterprise

A person can get sick or just wish to take a holiday for a couple of weeks. What happens when service goes down or I need customer support urgently?