Filters whether to bypass the email notification for new user sign-up.
Parameters
- (3.0.0)
- ( MU ) . . .
- $user_login
- ( string ) User login name. . . .
- $user_email
- ( string ) User email address. . . .
- $key
- ( string ) Activation key created in wpmu_signup_user(). . . .
- ( array ) $meta Signup meta data. Default empty array. . . .
