NOTE: Instead of adding dodgy code to an email that may affect delivery or breach GDPR and other data security protocols we determine Opens by deductive logic. When an email is opened our images are pulled down from the servers, so we use the image download as the indicator an email is being opened.This can result in a 'false negative'. If a recipient has image blocking then the images will not be downloaded and it will appear that the email has not been opened. Therefore Opens is not a 100% accurate report - but statistically, it is 87% accurate. Said another way we give people 87% more visibility over delivery and readership than they had prior.