+ case 'php':
+ default:
+ return (boolean)filter_var($address, FILTER_VALIDATE_EMAIL);
+ }
+ }
+
+ /**
+ * Tells whether IDNs (Internationalized Domain Names) are supported or not. This requires the
+ * "intl" and "mbstring" PHP extensions.
+ * @return bool "true" if required functions for IDN support are present
+ */
+ public function idnSupported()
+ {
+ // @TODO: Write our own "idn_to_ascii" function for PHP <= 5.2.
+ return function_exists('idn_to_ascii') and function_exists('mb_convert_encoding');
+ }
+
+ /**
+ * Converts IDN in given email address to its ASCII form, also known as punycode, if possible.
+ * Important: Address must be passed in same encoding as currently set in PHPMailer::$CharSet.
+ * This function silently returns unmodified address if:
+ * - No conversion is necessary (i.e. domain name is not an IDN, or is already in ASCII form)
+ * - Conversion to punycode is impossible (e.g. required PHP functions are not available)
+ * or fails for any reason (e.g. domain has characters not allowed in an IDN)
+ * @see PHPMailer::$CharSet
+ * @param string $address The email address to convert
+ * @return string The encoded address in ASCII form
+ */
+ public function punyencodeAddress($address)
+ {
+ // Verify we have required functions, CharSet, and at-sign.
+ if ($this->idnSupported() and
+ !empty($this->CharSet) and
+ ($pos = strrpos($address, '@')) !== false) {
+ $domain = substr($address, ++$pos);
+ // Verify CharSet string is a valid one, and domain properly encoded in this CharSet.
+ if ($this->has8bitChars($domain) and @mb_check_encoding($domain, $this->CharSet)) {
+ $domain = mb_convert_encoding($domain, 'UTF-8', $this->CharSet);
+ if (($punycode = defined('INTL_IDNA_VARIANT_UTS46') ?
+ idn_to_ascii($domain, 0, INTL_IDNA_VARIANT_UTS46) :
+ idn_to_ascii($domain)) !== false) {
+ return substr($address, 0, $pos) . $punycode;
+ }
+ }