In their Office 2013 suite, Microsoft has made the process of adding an HTML signature more complicated than it used to be. Thankfully, there’s always a workaround. If you use Outlook’s normal signature creating process, you will have all of your images passed through as attachments, even if they are remote images.
Before you begin installing the signature, you will need to see the hidden files and file extensions.
Now that this is done, we can get working on installing your signature.