It is a real pain, I host a small email service, and spend at least an hour a day dealing with issues sending emails.Mainly because users think it is entirely acceptable to send thousands of emails a day thinking they will get results from it. However, I have to say that I am telling most people to move away from email as it isn't that secure and those free email addresses from old ISPs are terribly insecure. Also seeing a lot of data stolen as people think 2FA via email is great, so hackers just hack the email server and boom