apply_filters( 'wpmu_welcome_notification', int|false $blog_id, int $user_id, string $password, string $title, array $meta )

Parameters

$blog_id

(int|false) Site ID, or false to prevent the email from sending.

$user_id

(int) User ID of the site administrator.

$password

(string) User password, or "N/A" if the user account is not new.

$title

(string) Site title.

$meta

(array) Signup meta data. By default, contains the requested privacy setting and lang_id.