Drag and Drop directly from Outlook to a webform
The easiest solution I found is to just create an Add-In for Outlook to add the email to our database.
I found this sample WebApp where you can drag and drop Outlook Contacts to an HTML5 WebForm.
If you drag an Outlook Message directly from Outlook to the WebForm you can drop it, but nothing happens. Maybe with a little tweaking you can get it to work with Messages too.
regards