Should image urls <img src=""> have http or https?
I've been searching around for a best practice on image urls <img src=""> and havn't been able to find too much. A member voiced concern over an image in our email not being secure (http). Are there any issues with using https in the <img src="">?
The only aricle on this subject I found was here. It mentions that Outlook 2007, 2010 and 2013 have issues displaying https.