Description:

Matomo allows to configure allowed email domains. Only email addresses that matches those domains can then be used.
To avoid any current users to become "invalid" the list always needs to contain all domains for existent users.
This at the moment also contains the domain of the automatically created anonymous user, which is example.org. As it doesn't make sense to always allow addresses for this domain only because of the anonymous user, this PR changes the code, so the anonymous user's email domain is ignored for this setting and checks.

fixes #22009

Review

• Functional review done
• Potential edge cases thought about (behavior of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• Security review done
• Wording review done
• Code review done
• Tests were added if useful/possible
• Reviewed for breaking changes
• Developer changelog updated if needed
• Documentation added if needed
• Existing documentation updated if needed