Отправка e-mail администратору при регистрации нового пользователя

[merefield (Robert)]

Я с радостью помогу вам с этим, но разве это не решает вашу проблему?:

Email notification for "must approve users"

The frequency of the reminder is controlled by the pending users reminder delay site setting. The default value of that setting is 8 hours. Try setting it to a lower value. The pending user notifications are triggered by a background job that is run once per hour. This means that setting the pending users reminder delay to 0 will still cause the notifications to only be generated once per hour. Note that these notifications are only sent to site moderators, not to site admins.