But the only actual open border is a two way street. (reason.com)
After that, you'll see a list of civilian job titles and in some cases, actual open positions. (uptowork.com)
Since image blocking is probably employed by at least some of your subscribers, the number of actual opens for a particular campaign will always be higher than your software indicates (that is, there will be people who opened your email and read it without displaying the image that would record their open). (lawyercasting.com)