无法将邮件迁移到“垃圾邮件”。

MailItemEntry[] entries = new MailItemEntry[1];
entries[0]              = new MailItemEntry();
entries[0].Rfc822Msg    = new Rfc822MsgElement(msg);
entries[0].MailItemProperties.Add(MailItemPropertyElement.TRASH);                                  

entries[0].Labels.Add(new LabelElement("Trash"));