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c# - Don't save embed image that contain into attachements (like signature image)

I work on a VSTO in c#. When I click on button I save attachment in a folder. My problem is : when I have a rich email with an image in the signature, I have a element in my attachment. But I don't want save that image. Outlook (application) hide this attachment in the area attachment ! So why not me :-(

My code is very simply :

MailItem MailItemSelected =  this.OutlookItem;   
foreach (Attachment a in MailItemSelected.Attachments)
{
   a.SaveAsFile(path + a.FileName);
}

But I don't find a test for don't save the image of the signature.

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We had a need to show only the "Mail Attachments" (not the embedded ones that are used for rendering) in an Outlook Add - In, and this is what that works.

 if (mailItem.Attachments.Count > 0)
        {
            // get attachments
            foreach (Attachment attachment in mailItem.Attachments)
            {
                var flags = attachment.PropertyAccessor.GetProperty("http://schemas.microsoft.com/mapi/proptag/0x37140003");

                //To ignore embedded attachments -
                if (flags != 4)
                {
                    // As per present understanding - If rtF mail attachment comes here - and the embeded image is treated as attachment then Type value is 6 and ignore it
                    if ((int)attachment.Type != 6)
                    {

                        MailAttachment mailAttachment = new MailAttachment { Name = attachment.FileName };
                        mail.Attachments.Add(mailAttachment);
                    }

                }

            }
        }

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