Email PGP Fingerprints
If you get an important message by mail from Doerzbach Engineering GmbH it is signed with the pgp key with the fingerprint:

32C5 7168 831A 946B 6C66 3A9C 16DC 6B1B F528 11A1

You can download the public key at https://keys.openpgp.org/ by searching for the senders email.

Do not trust any other emails.