To find out, Ryan Solutions looked at 1,200 resort email campaigns sent to over 70,000,000 recipients over the last 9 months. Because this theory has been based on both the maximum file size of any one image as well as the combined file size of all images in a message, the team analyzed both concepts using open rates as an indicator of success in reaching the inbox. In terms of combined file size, it does appear that spam filters are triggered once you reach a certain level, strengthing the case that some of the things we often assume about image file sizes and spam may not be as strict as we thought. Get the full story at Ryan Solutions