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apply_filters( 'update_welcome_user_email', string $welcome_email, int $user_id, string $password, array $meta )

Filters the content of the welcome email after user activation.

Content should be formatted for transmission via wp_mail().

$welcome_email: (string) The message body of the account activation success email.
$user_id: (int) User ID.
$password: (string) User password.
$meta: (array) Signup meta data. Default empty array.

Used By	Description
wp-includes/ms-functions.php: wpmu_welcome_user_notification()	Notify a user that their account activation has been successful.

Version	Description
MU (3.0.0)	Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/hooks/update_welcome_user_email