How it works

Card Mailer works inside the AI assistant you already use. You describe the card, attach your photo and list, check the preview, then pay on this site.

In ChatGPT

Card Mailer is in review for the ChatGPT app directory. Once it's listed, open Apps in ChatGPT, search for "Card Mailer" and connect it, or type "@Card Mailer" in a chat.

Until then, on a plan with developer mode you can add it yourself: Settings → Apps → Advanced → Developer mode, then Create app with the server URL https://cards.onmax.me/mcp.

In Claude

Open Settings → Connectors → Add custom connector, name it "Card Mailer" and enter https://cards.onmax.me/mcp. Then ask Claude to make and mail your cards.

How to use it

Order on this site or use Card Mailer from ChatGPT or Claude:

1. Open Card Mailer in ChatGPT or ClaudeAsk for a card and attach your photo and address list. A spreadsheet, CSV, contacts export or pasted text all work.

2. Check the card and the listYou see the front and back of the card. Addresses are checked against USPS data, and any that won't deliver are flagged so you can fix them in place.

3. Pay and pick a datePay on our checkout page. The cards print and go out by USPS First-Class on the date you choose, and you can follow each one until it's delivered.

Try asking:

Make a holiday card from this family photo with the message we wrote and mail it to the 42 addresses in this spreadsheet before Dec 15.

Send a thank-you card to each of my clients in this CSV. Use our team photo and sign it from the whole office.

What you see before paying

The checkout page shows the exact front and back of the card, every recipient, the total and the send date. Nothing is printed and nothing is charged until you pay there.