Yes you can.
We have an embedded image feature which sends the images as apart of the email as opposed to referencing them via URL. This means that email clients like Outlook will not block the images. With the embedded images feature turned on you may notice conversations between mobile devices begin to have the images from the history as regular attachments (the email at the top of the chain will still have images embedded correctly). This is a limitation of some mobile email clients which do not send attachments when replying in order to save bandwidth.