Create an RWMimeMultipart

Construct the part as an instance of RWMimeMultipart:

RWMimeMultipart multipartMessage;

Although a multipart is not required to contain a preamble, most multipart messages that contain human-readable content provide one. Set the preamble using the setPreamble() function:

multipartBody.setPreamble("This is a MIME message.\r\n"

"\r\n"

"If you see this message, your user"

"agent is not MIME-compliant\r\n");