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Mail that matters, explained simply.

The French letters that matter, and how to send them without a printer or a trip to the post office.

Send a registered letter in France online
A paper registered letter posted for you, or an electronic registered letter: how each works, what it proves, and what it costs.
Ordinary, tracked or registered letter in France: which one?
What each French postal option really proves, and which to choose for a cancellation, a reminder or a letter with nothing at stake.
Unclaimed registered letter in France: what happens?
The 15 days at the post office, the return to sender, and why the date of the first delivery attempt often matters more than collection.
Writing a mise en demeure (formal notice) in France
What a French formal notice is for, what it must contain and how to send it, with a sample letter to adapt.
Have ChatGPT or Claude send a postal letter
An AI assistant can write a letter, not post it. With an MCP server like Cachet, it can send it for real, once you approve.
Proving you sent a letter in France, and sharing its tracking
Proof of posting, proof of receipt, a copy of the letter: what each document proves, how to keep them, and how to show the tracking without giving everything away.
Cancelling a subscription in France: online or by letter
Internet, gym, magazines, phone: the cancellation button, the loi Chatel, notice periods, and when a registered letter is still worth it.
Cancelling insurance in France: renewal date, loi Hamon, mutuelle
Car, home, top-up health insurance, mortgage insurance: when you can cancel, when it takes effect, and how to send the request.
Giving notice to your landlord in France
Three months or one, the reasons that shorten the notice period, how to send it so it counts, with a sample notice letter to adapt.
Chasing an unpaid invoice in France, step by step
Friendly reminder, late payment interest, the €40 recovery fee, formal notice, order for payment: how to get paid by a business client.

These guides explain each step on its own. When the time comes, your AI assistant writes the letter and Cachet posts it.

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Guides

Send a registered letter in France online
Ordinary, tracked or registered letter in France: which one?
Unclaimed registered letter in France: what happens?
Writing a mise en demeure (formal notice) in France
Have ChatGPT or Claude send a postal letter
Proving you sent a letter in France, and sharing its tracking
Cancelling a subscription in France: online or by letter
Cancelling insurance in France: renewal date, loi Hamon, mutuelle
Giving notice to your landlord in France
Chasing an unpaid invoice in France, step by step
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