How to embed images in email

Question

I need to embed an image in e-mail. How do I do it?

I do not want to use third party tool, nor am I interested in language specific answer (but it is PHP, in case yo

Answer 1

Correct way of embedding images into Outlook and avoiding security problems is the next:

1. Use interop for Outlook 2003;
2. Create new email and set it save folder;
3. Do not use base64 embedding, outlook 2007 does not support it; do not reference files on your disk, they won't be send; do not use word editor inspector because you will get security warnings on some machines;
4. Attachment must have png/jpg extension. If it will have for instance tmp extension - Outlook will warn user;
5. Pay attention how CID is generated without mapi;

6. Do not access properties via getters or you will get security warnings on some machines.

   public static void PrepareEmail()
   {
       var attachFile = Path.Combine(
           Application.StartupPath, "mySuperImage.png"); // pay attention that image must not contain spaces, because Outlook cannot inline such images
   
       Microsoft.Office.Interop.Outlook.Application outlook = null;
       NameSpace space = null;
       MAPIFolder folder = null;
       MailItem mail = null;
       Attachment attachment = null;
       try
       {
           outlook = new Microsoft.Office.Interop.Outlook.Application();
           space = outlook.GetNamespace("MAPI");
           space.Logon(null, null, true, true);
   
           folder = space.GetDefaultFolder(OlDefaultFolders.olFolderSentMail);
           mail = (MailItem) outlook.CreateItem(OlItemType.olMailItem);
   
           mail.SaveSentMessageFolder = folder;
           mail.Subject = "Hi Everyone";
           mail.Attachments.Add(attachFile, OlAttachmentType.olByValue, 0, Type.Missing); 
           // Last Type.Missing - is for not to show attachment in attachments list.
   
           string attachmentId = Path.GetFileName(attachFile);
           mail.BodyFormat = OlBodyFormat.olFormatHTML;
   
            mail.HTMLBody = string.Format("
   ", attachmentId);
   
           mail.Display(false);
       }
       finally
       {
           ReleaseComObject(outlook, space, folder, mail, attachment);
       }
   }