深入Lumisoft.NET组件与.NET API实现邮件发送功能的对(5)

//设置回执通知
            if (!string.IsNullOrEmpty(notifyEmail) && ValidateUtil.IsEmail(notifyEmail))
            {
                msg.DispositionNotificationTo.Add(new Mail_t_Mailbox(notifyEmail, notifyEmail));
            }

#region MyRegion

//--- multipart/mixed -----------------------------------
            MIME_h_ContentType contentType_multipartMixed = new MIME_h_ContentType(MIME_MediaTypes.Multipart.mixed);
            contentType_multipartMixed.Param_Boundary = Guid.NewGuid().ToString().Replace('-', '.');
            MIME_b_MultipartMixed multipartMixed = new MIME_b_MultipartMixed(contentType_multipartMixed);
            msg.Body = multipartMixed;

//--- multipart/alternative -----------------------------
            MIME_Entity entity_multipartAlternative = new MIME_Entity();
            MIME_h_ContentType contentType_multipartAlternative = new MIME_h_ContentType(MIME_MediaTypes.Multipart.alternative);
            contentType_multipartAlternative.Param_Boundary = Guid.NewGuid().ToString().Replace('-', '.');
            MIME_b_MultipartAlternative multipartAlternative = new MIME_b_MultipartAlternative(contentType_multipartAlternative);
            entity_multipartAlternative.Body = multipartAlternative;
            multipartMixed.BodyParts.Add(entity_multipartAlternative);

//--- text/plain ----------------------------------------
            MIME_Entity entity_text_plain = new MIME_Entity();
            MIME_b_Text text_plain = new MIME_b_Text(MIME_MediaTypes.Text.plain);
            entity_text_plain.Body = text_plain;

//普通文本邮件内容，如果对方的收件客户端不支持HTML，这是必需的
            string plainTextBody = "如果你邮件客户端不支持HTML格式，或者你切换到“普通文本”视图，将看到此内容";
            if (!string.IsNullOrEmpty(plaintTextTips))
            {
                plainTextBody = plaintTextTips;
            }