This morning we sent out a campaign and for some reason the images will not display in the the Gmail web browser. They will display when opening the same email in Apple Mail. The images are hosted on our server (ex. http://www.northernlightscandles.com/email/2017/responsiveassets/logos/NL-Header-Logo.png) and the "Last Day" image is hosted in the same place but that displays just fine. Any idea what could be causing this?