Send Mail with attachment using Gmail new API, but it is not displayed for receiver's inbox

Question

We are integrating GMail using the latest API provided by them as a part of developing email client within our application. We are using PHP client library provided by Googl

Answer 1

Replace your:

$strRawMessage .= 'Content-type: Multipart/Alternative; boundary="' . $boundary . '"' . "\r\n";

with:

$strRawMessage .= 'Content-type: Multipart/Mixed; boundary="' . $boundary . '"' . "\r\n";