Unable to register a Petal Mail address

You cannot register with an email address in any of the following situations:

1. The format is incorrect or does not comply with the naming rules.

   Naming rules: The email address must start with a letter and only contain between 6 and 30 letters, digits, and underscores (_), and periods (.).

2. The email address has already been registered.
3. The email address has been used and then deregistered by another user (Petal Mail addresses cannot be reused).
4. The email address is unavailable in order to protect users from spam and email abuse.