The MQMailEMailType structure describes the type of mail: text message, form, TNEF message, delivery report, or non-delivery report e-mail.
typedef enum MQMailEMailType_enum
{
MQMailEMail_MESSAGE, //Mail is text message.
MQMailEMail_FORM, //Mail is form with fields.
MQMailEMail_TNEF, //Mail is in MAPI TNEF format.
MQMailEMail_DELIVERY_REPORT //Mail is a delivery report.
MQMailEMail_NON_DELIVERY_REPORT //Mail is a non-delivery report.
} MQMailEMailType;