An email QR code opens a new draft message with your address already filled in, and optionally a subject line and body text. It removes the friction of typing an address from a poster or invoice, and it gives you a way to pre-label enquiries — a subject like "Quote request" makes filtering easy on your side. Enter the recipient address, add any default wording, and download a PNG for print or for the signature block of a document.
No. It only opens a draft — the sender still has to press send.
Use a shared inbox address instead; multiple recipients are handled inconsistently across mail apps.
A long default message adds a lot of data. Shorten the body text to simplify the pattern.