Please see attached screenshot. After initial connection to the mimecast server, mimecast responds with a request for authentication: Response: 250-za-smtp-1.mimecast.co.za Hello [41.193.98.138 (41.193.98.138)]\r\n Response: 250-AUTH PLAIN LOGIN\r\n Response: 250-AUTH=PLAIN LOGIN \r\n Response: 250-...