Pre-filled email removes every excuse not to write
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The distance between someone thinking they should email you and an email actually arriving is made of small frictions: finding the address, typing it correctly, and staring down a blank compose window. A scanned code deletes all three. The message is addressed, the subject is set, and the body already says most of what needs saying.
The body works best as a short template rather than a finished letter. Prompts like an order number line for support, or a names-and-count line for an RSVP, mean replies arrive complete instead of starting a back-and-forth. Keep it brief; the sender sees everything and can rewrite any of it before sending.