you can use this filter to do that
add_filter("sanitize_email", function ($sanitized_email, $email, $message) {
$sanitized_email = strtolower($sanitized_email);
return $sanitized_email;
}, 10, 3);
but I am not sure if using “strtolower” is a good idea, does another readers know if it’s better to use “mb_strtolower” to handle multibyte characters ?
https://www.php.net/manual/en/ref.mbstring.php
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