Here is another NTT DoCoMo format where it defines a format that would also allow you to include a subject and a message. For example, encoding the following into a barcode and upon scanning, a mobile reader will open email client with recipient email address, subject and message body filled out -;SUB:QRCode Generator;BODY:you guys are doing a great job!;;.


use Da\QrCode\QrCode;
use Da\QrCode\Format\MailMessageFormat; 

$format = new MailMessageFormat(['email' => '', 'subject' => 'test', 'body' => 'test-body']);

$qrCode = new QrCode($format);

header('Content-Type: ' . $qrCode->getContentType());

echo $qrCode->writeString();

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