E-mail Opens : Number of e-mails opened by your receivers. The percentage is calculated using the number of e-mails sent in HTML as AcyMailing can not determine the number of e-mails opened for the plain text version. AcyMailing adds a small blank picture in all your HTML Versions in order to determine if the e-mail has been opened or not. Your receivers may open the e-mail but not accept to display pictures, in which case AcyMailing will consider the e-mail as not being opened. This number indicates the MINIMUM number of e-mails read by your receivers, not the real one as AcyMailing cannot track all of them. If you click on the link, you will be redirected to the detailed statistics listing.