There is a known issue when it comes to email templates which we are currently working on fixing in a future release of this email module. The work around we suggest you use in the mean time is to simply edit the image file path in the source code of the email.
For example, when you insert an image in the email template it will save in the sourcecode with the following html format. img src = /image/nameofimage.jpg
Simply insert the url of your website in this line of code.