Reply email with inline images EWS using C#

Question

I am trying to reply an email with inline images in email body. But I did not get any success.
My code is as below

                            PropertySet propSet = new PropertySet(BasePropertySet.FirstClassProperties, ItemSchema.LastModifiedTime);
                            EmailMessage _messageReply = EmailMessage.Bind(service, outlookEmailId, propSet); //binding with existing incoming email , outLookEmailId = UniqueId of incoming email
                           ResponseMessage responseMessage = _messageReply.CreateReply(true);                              
                           responseMessage.BodyPrefix = Body; // html body contains inline images with base64 file system i.e. <img src="data:image/png;base64,iVBORw0KGgoAA"/>
                           _messageReply= responseMessage.Save();
                           _messageReply.SendAndSaveCopy();

After SendAndSaveCopy, at recipient end, it does not show any inline images.
For new email it works perfect , problem is with replying email ( using Bind method)
Does anybody know, how to reply an email with inline images?

Answer 1

@NILESH PATEL , based on my test, I could use the following code to send a mail with inline message and you can have a look.

        ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010);  
        service.Credentials= new NetworkCredential("******@hotmail.com","password");  
        service.Url=new Uri("https://outlook.office365.com/EWS/Exchange.asmx");  
        ItemView view = new ItemView(50);  
        List<SearchFilter> searchFilterCollection = new List<SearchFilter>();  
        searchFilterCollection.Add(new SearchFilter.ContainsSubstring(ItemSchema.Subject, "Test0220"));  
        SearchFilter searchFilter = new SearchFilter.SearchFilterCollection(LogicalOperator.And, searchFilterCollection.ToArray());  
        FindItemsResults<Item> results = service.FindItems(WellKnownFolderName.Inbox, searchFilter, view);  
        PropertySet propSet = new PropertySet(BasePropertySet.IdOnly, ItemSchema.Subject, EmailMessageSchema.IsRead);  
        EmailMessage message = EmailMessage.Bind(service, results.FirstOrDefault().Id, propSet);  

        ResponseMessage responseMessage = message.CreateReply(true);  

        string file = @"D:\2.jpg";  
        message.Attachments.AddFileAttachment("2.jpg", file);  
        message.Attachments[0].IsInline = true;  
        message.Attachments[0].ContentId = "2.jpg";  
        responseMessage.BodyPrefix = new MessageBody(BodyType.HTML, @"<img width=100 height=100 id=""1"" src=""cid:2.jpg"">");  
        responseMessage.Save();  
        responseMessage.Send();  

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Answer 2

Most Email Clients are not supporting Base 64 Images in the Body, these are part of their security measures though a large amount of criticism out there.

One of the alternative is to use Content-ID Format: https://www.rfc-editor.org/rfc/rfc2392.html

An example is available there.

https://www.c-sharpcorner.com/UploadFile/40e97e/html-email-with-embedded-image/