What the Mailto Payload Carries
An email QR code stores a single web address built on the mailto scheme. That address packs three things into one line: the recipient address, an optional subject, and an optional message body. The generator takes your inputs and encodes them properly, escaping spaces and punctuation so the email app reads every field correctly. When someone scans the code, the phone recognizes the mailto link and opens the default mail app with all three fields already filled in. The recipient sits in the To line, your subject appears in the subject line, and your draft text sits in the body waiting to be sent. Nothing is sent automatically. The person reviews the message and presses send themselves, which keeps them in control. Because the whole instruction lives inside the code, it works the moment the camera reads it, with no web page to load in between. If you want a message to go by text instead, the SMS QR Code Generator handles that path.