How is the number of opened emails calculated?

How is the number of opened emails calculated? Is there some sort of a reply sent from the email client to the sender?

The number of opened emails is tracked using a tiny, invisible image in the newsletter. When this is opened with the newsletter, we know that the recipient has opened the email. You do not need to alter any settings to make this possible.

Other questions about Important Statistics

What is the CTR (Click-through-rate)? Can I define the time-frame for the evaluations found in the reports? What is the unique click rate? What are the ‘average clicks’? What does ‘Clicks’ mean? What are the ‘unique clicks’? What are the ‘average opens’? How can I find out which recipients did, and did not, read my newsletter, click on it, unsubscribe from it; or whether they bounced? What is meant by ‘Thresholds’ in the newsletter reports? How can I use conversion tracking with Newsletter2Go?

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