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Notify a user that his/her blog activation has been successful.
<?php wpmu_welcome_notification($blog_id, $user_id, $password, $title, $meta ); ?>
Filter 'wpmu_welcome_notification' to disable or bypass.
Filter 'update_welcome_email' and 'update_welcome_subject' to modify the content and subject line of the notification email.
Since: MU
wpmu_welcome_notification() is located in wp-includes/ms-functions.php