wp-includes/PHPMailer/POP3.php:417Checks the POP3 server response.
$stringstringbool protected function checkResponse($string) { if (strpos($string, '+OK') !== 0) { $this->setError("Server reported an error: $string"); return false; } return true; }Unchanged from 6.9.7 through 7.1.0.
Signature, return type and hooks compared across 3 parsed releases.
src/wp-includes/PHPMailer/POP3.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.