wp-includes/PHPMailer/PHPMailer.php:4516Build an error message starting with a generic one and adding details if possible.
$base_keystringstring private function getSmtpErrorMessage($base_key) { $message = self::lang($base_key); $error = $this->smtp->getError(); if (!empty($error['error'])) { $message .= ' ' . $error['error']; if (!empty($error['detail'])) { $message .= ' ' . $error['detail']; } } return $message; }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/PHPMailer/PHPMailer.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.