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How to Send a Thank-You Letter From Your Phone

The Sent Instantly app turns a note you type on your phone into a real letter in the mail.

You can send a real thank-you letter from your phone in about the time it takes to write a text. The Sent Instantly app is on the App Store and Google Play. You write the note on your phone. We print it and mail it with USPS.

How it works

  • Pick an occasion. Thank you, birthday, congratulations, sympathy and more. Each one gives you a place to start, and every word is yours to change.
  • Choose who it's for. Pick the person from your contacts. Only the address you choose is used.
  • Write it on the page. Choose a handwriting-style font and stationery, and preview the page before you send it.
  • Choose how it's mailed. A letter folded into a standard envelope and sent USPS First-Class, a Certified letter with a tracking number, or flat in a rigid mailer with tracking.
  • Pay, and you're done. No account needed. Your receipt, and any tracking number, come by email.

We mail to the address exactly as it's entered, so give the apartment or suite number a quick look before you pay.

When it's handy

  • On the phone with Grandma. She tells you about the quilt she finished for the baby. Write the thank-you while she's still talking, and send it before you hang up.
  • In the car after a closing. The keys are handed over and the client is still smiling. Write the note before you pull out of the driveway.
  • On the lot after a delivery. The customer just drove away in the new car. Write the thank-you before your next appointment.
  • After guests check out. A short note that mentions their stay, sent while it's still fresh.

The same app serves our sister sites for agents, dealerships, professional offices and short-term rental hosts: RealtyThankYou, DealershipThankYou, ProfessionalThanks and StayThankYou. There, a business can add its own logo at the top of the letter and a few footer lines, like a name, a license number or a phone number.

A note that lands

  • Name one specific thing. The quilt, the closing, the road trip in the new car. One real detail beats three lines of general thanks.
  • Keep it short. Three or four sentences is plenty.
  • Don't ask for anything. No review request, no referral ask. A thank-you that wants something reads like a form.

Rather write on a computer? The same letter writer is on our website.

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Frequently Asked Questions

Do I need a printer or stamps?

No. We print the letter, and the envelope and postage are included in the total you see before you pay.

Do I need an account?

No. You pay at checkout, your receipt comes by email, and the letters you've sent are listed on your phone.

Can I send the same letter to a list of people?

Yes. Write one letter and personalize it for everyone on a spreadsheet. On the website, it's on our bulk mail page.

Is there an Android version?

Yes. The same app is on Google Play.

Last updated October 19, 2026

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