Hi @julians1976
How is that even possible? Did you add and sign these domains / zone files manually? If yes, you can simply edit the .txt file and then re-sign the zone using the same command you were using when you first signed the zone…
A simple resatart of the NSD service definetly does not re-sign the zone automatically. This has to be done with the ldns-signzone command. But I don’t know how the Mail-in-a-Box scripts are managing the zone files. Maybe you can look through the code on GitHub to find out how Mail-in-a-Box actually manages NSD. For re-signing the zone manually you need to know the path to key-signing key file, to the zone-signing key file and there is probably some salt that was generated when the zone was initially signed. The command would then look someting like this:
ldns-signzone -n -p -s "-the-salt-that-was-generated-" yourdomain.tld.txt Kyourdomain.txt.+013+11330 Kyourdomain.txt.+013+59536