API, MCP, and CLI
5 May 2026
Connect PieterPost to ChatGPT, Claude, Codex, Claude Code, and more. Your agents can now create and send real letters and postcards from the tools they already use.
Changelog
Product updates, shipped quietly.
A running log of the small and large changes that shaped Pieterpost after launch.
Postbox Hunt
21 April 2026
Started Postbox Hunt: a map-based challenge where you find real postboxes, take a photo, and collect them in PieterPost. It is live in the Netherlands for now, with more places planned later.
Mailbook birthdays
31 March 2026
Added birthdays to Mailbook, plus reminder emails one week before the date so you still have time to send a card or message.
QR code for pay it forward
21 June 2025
Added a QR code to the pay it forward functionality. The recipient will also see next to the discount code a QR code.
Added multiple languages
23 May 2025
Added support for multiple languages. The website is now available in Dutch, English, German, Spanish, French, and Italian.
Updated .pdf upload functionality
7 May 2025
Added more support for .pdf files. It's quite a technical thing and not super interesting, but now almost all .pdf files are supported.
Discount code functionality
1 May 2025
Added a discount code functionality to the checkout page. You can now add a discount code to your letter. And because you are reading all this, you can use the discount code PIETER50 to get a discount.
World Map
29 April 2025
Added a world map to the website where you can see where the letters are going. Just for fun.
Character support
25 April 2025
Added support for Mandarin Chinese and Finnish characters.
Preview functionality for attachments
21 April 2025
You can now see a preview of photos and .pdfs you upload before you send your letter.
Dropzone
12 April 2025
Based on your feedback, we've added a dropzone functionality to make it easier to attach files.
Fullcolor letters
8 April 2025
We received lots of messages that people were wondering of the letters were printed in full color. Full color is now the standard.
Introducing PieterPost
1 April 2025
Launched the first version of Pieterpost for a small group of beta testers.
