wp-includes/PHPMailer/PHPMailer.php:1142Add an address to one of the recipient arrays or to the ReplyTo array. Because PHPMailer can't validate addresses with an IDN without knowing the PHPMailer::$CharSet (that can still be modified after calling this function), addition of such addresses is delayed until send().
$kindstring$addressstring$namestringbool protected function addOrEnqueueAnAddress($kind, $address, $name) { $pos = false; if ($address !== null) { $address = trim($address); $pos = strrpos($address, '@'); } if (false === $pos) { //At-sign is missing. $error_message = sprintf( '%s (%s): %s', self::lang('invalid_address'), $kind, $address ); $this->setError($error_message); $this->edebug($error_message); if ($this->exceptions) { throw new Exception($error_message); } return false; } if ($name !== null && is_string($name)) { $name = trim(preg_replace('/[\r\n]+/', '', $name)); //Strip breaks and trim } else { $name = ''; } $params = [$kind, $address, $name]; //Enqueue addresses with IDN until we know the PHPMailer::$CharSet. //Domain is assumed to be whatever is after the last @ symbol in the address if ($this->has8bitChars(substr($address, ++$pos))) { if (static::idnSupported()) { if ('Reply-To' !== $kind) { if (!array_key_exists($address, $this->RecipientsQueue)) { $this->RecipientsQueue[$address] = $params; return true; } } elseif (!array_key_exists($address, $this->ReplyToQueue)) { $this->ReplyToQueue[$address] = $params; return true; } } //We have an 8-bit domain, but we are missing the necessary extensions to support it //Or we are already sending to this address return false; } //Immediately add standard addresses without IDN. return call_user_func_array([$this, 'addAnAddress'], $params); }Unchanged from 6.7.7 through 7.1.0.
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src/wp-includes/PHPMailer/PHPMailer.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.