It's just a myth put around by some inexperienced user who has tried to set up a mail server or more likely by large companies who wants to give you ‘for free' the service.
It was actually much more difficult to manage them many years ago when you had to invent by hand how to filter spam. Now with common standards supported by many pre-packaged solutions, everything is much simpler and accessible to the less experienced. Of course, I admit that it takes a minimum of experience to make a backup of a text file containing the mailboxes and this could definitely be the toughest challenge 🙄.
Again ? We are in a self-hosting community and users must be helped to be autonomous, e-mail is a service that needs to be regained more than others, especially now that it is easier to manage and is for the most part hostage of large companies that make their own interests at the expense of users.
Someone will make mistakes , someone will miss a few emails and it is absolutely normal and physiological as for all kinds of services.
I got tired of discussing it with you, Your attitude is neither appropriate nor constructive for this community.
Welcome to my blocklist.