Why are my customers not receiving order emails?

When we set up Fitted to get you up and running, we do basic authentication to validate your email address. However, spam filters can change over time to require additional validation. To validate more please visit Sendgrid for domain authentication. There is a guide here on how to do it, which your web team can follow to do https://sendgrid.com/docs/ui/account-and-settings/how-to-set-up-domain-authentication/