- Use .* as the filter for mediawiki:email-blacklist
- Use \bvalidemail\.com\b for mediawiki:email-whitelist
- create account with validemail.com
- change email to something other than validemail.com
What happens?:
Users can register account with an allowed email and then change it to a blocked email address.
What should have happened instead?:
The checks should also happen when user changes email.
Software version (skip for WMF-hosted wikis like Wikipedia):
MW38.2