Yes, a username is mandatory requirement. My idea did not get through, let me try again please.
On some platforms, the email and the username are automatically set to be the same.
This is not ideal, although the email would be unique.
However for cloudron, please consider this:
On Cloudron, the system already generates a 'From Email' on its own.
I wish to propose that this email or the first part of it (before @) be used as the username.
Mail FROM Address
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Anything but 'admin' would be great.