For S/MIME-encrypted e-mail communication with poststelle@bsi.bund.de, please use the following certificates:

1. Root certificate for PKI administration: PCA-1-Verwaltung-15
   Valid: 18/08/2015 to 19/08/2025
   Fingerprint: 8E:D4:A9:36:A8:BD:E9:4E:8C:88:FA:25:1E:E2:A9:11:07:F9:89:82

2. NdB intermediate certification of Deutsche Telekom AG: CA IVBB Deutsche Telekom AG 18
   

   Valid: 20/03/2024 to 18/01/2026
   Fingerprint: 3956 630B 4B03 B19B 98EB 3665 5578 1EF0 F6F3 883C

3. Postal Department certificate: GRP Poststelle
   Valid: 17/01/2023 to 18/01/2026
   Fingerprint: 3956 630B 4B03 B19B 98EB 3665 5578 1EF0 F6F3 883C
   

Please include the certificates in your e-mail client.