Registered mail delivered to a letterbox: How reliable is proof of delivery now?

Anyone sending an important letter wants to be sure it arrives. Timely receipt can be particularly crucial for termination notices, objections or payment demands.

Many people therefore use registered mail delivered to the recipient’s letterbox (Einwurf-Einschreiben). However, a Federal Labour Court ruling of 7 May 2026 shows that a documented delivery process is not always sufficient to prove receipt in court. Deutsche Post has since adjusted its procedure. Nevertheless, questions about its legal evidential value remain unresolved.

What did the Federal Labour Court decide?

The case, reference 2 AZR 184/25, concerned an employee who had been dismissed because of frequent illness. According to the employer, it had previously sent him an invitation to a workplace reintegration management process by registered mail delivered to his letterbox. However, the employee denied receiving this invitation.

The employer submitted dispatch and delivery records. The court found that the electronic procedure used at the time did not establish sufficient prima facie evidence of receipt. The reason: The postal worker had electronically confirmed the item as delivered before actually putting it into the letterbox. This did not provide sufficient assurance that the documented delivery had actually taken place.

Important: The court did not rule that registered mail delivered to a letterbox is generally ineffective. It criticised the specific delivery procedure.

What has Deutsche Post changed?

According to Deutsche Post, the delivery procedure has already been adjusted. Under the new procedure, placing the item in the letterbox is additionally confirmed and documented digitally. This is intended to prevent an item from being treated as delivered before it has actually been put into the letterbox.

Deutsche Post considers the new procedure more reliable than the previous one. However, whether these changes are sufficient to establish prima facie evidence of receipt in court again has not yet been definitively decided.

What does this mean for consumers?

Although the ruling concerns an employment law dispute, the question of receipt of important letters also matters in other areas of life.

• Ending a residential tenancy: The landlord must receive the termination notice in time.
• Cancelling insurance: For certain cancellation notices, receipt determines whether a deadline has been met.
• Terminating an employment contract: A termination notice must reach the recipient. The statutory written-form requirement must also be observed.
• Reclaiming money: Anyone setting a payment deadline should be able to prove receipt of the demand.
• Letters to public authorities: Applications or legal remedies may be subject to deadlines and special transmission rules.

Anyone sending a declaration often has to prove its receipt in the event of a dispute. Proof of posting alone is not always sufficient.

Is registered mail with acknowledgement of receipt safer?

With registered mail with acknowledgement of receipt, the item is handed to someone authorised to receive it. The handover is confirmed by a signature, and the sender receives corresponding proof. This can be helpful in a later dispute.

However, there is a drawback: If nobody is available and the letter is not collected, delivery may fail. An acknowledgement of receipt is therefore not the best solution in every situation. In addition, it generally confirms receipt of the item, not the specific contents of the letter.

What alternatives are available?

What should you bear in mind with important letters?

1. 1Check the deadline. Sometimes posting a letter on the last day is not enough. What may matter is when the recipient receives it.
2. 2Check the required form. Not every termination notice can be sent by email. Notices terminating employment relationships and residential tenancies must generally be made in writing.
3. 3Document the contents. Keep a copy of the letter. For particularly important items, someone can testify to which document was actually placed in the envelope.
4. 4Keep proof of dispatch. This includes posting receipts, tracking numbers, delivery records and, where applicable, acknowledgements of receipt.
5. 5Choose a suitable delivery method. For important or tight deadlines, personal handover or delivery by a reliable messenger may be sensible.

Conclusion

The Federal Labour Court’s ruling does not mean the end of registered mail delivered to a letterbox. However, it shows that an electronic delivery record alone is not sufficient in all circumstances to prove receipt of a letter.

Deutsche Post has responded to the legal concerns by changing its procedure. A definitive judicial assessment of these changes is still pending. For consumers, the key point therefore remains: With important letters, it is not just dispatch that matters, but also provable receipt and, where relevant, the contents.

As of: 2 November 2026. This information provides general guidance and is not a substitute for legal advice in individual cases.