This is a link that generates an email message.Click to send email
If you click this link on your mobile device, an outgoing email message will be generated that includes the address, the subject line and a short message.
If you really wanted to you could make the message a lot longer but you should always bear in mind that the sender could edit the message before clicking send.
One reason why it can be useful to get customers to respond to your QR Code campaigns by sending you an email is that their own email address details will automatically get passed to you which means that, subject to privacy and anti-spam laws, you can contact them directly.
If someone simple visits your website, you generally don’t know who they are and so getting back in touch with them is very difficult although remarketing can help to some extent,