* Support registration domain whitelist (registration/emailproviderwhitelist) that, if set, will require a user to have an email with one of the specified domain providers. Will require client updates to see the Whitelist message, otherwise they'll be greeted with a default alert.
This also works to remove the pain of Google Email addresses and their infinite combination of usernames for the same account (i.e. remove periods and everything after the first plus sign).
* Make blacklist response show custom dialog
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