When creating an account at community.e.foundation, I encountered that my email address @e.email was not allowed, so I had to use my email from a different provider. Ironic!?
Did you try with
@murena.io? If that does not work then yeah, that wouldn’t make sense.
You can create an account on the forum with e.email ID. Had this checked out by the infra team. I suggest you write in to firstname.lastname@example.org sharing details of the account you were facing an issue with and the team will look into it.