Info: Volume Management (Where Is My Data?)

All the data, for example mails, DKIM keys, account credentials (in MySQL), TLS certificates and junk mail training information is stored in Docker volumes.

These volumes are defined in docker-compose.yml:

volumes:
  data-db:
  data-dkim:
  data-mail:
  data-tls:
  data-filter:
  data-virusdb:

Run docker volume inspect <name> to get their real path in the filesystem, or mount them into a different container to get access to their files. docker volume ls will list all existing volumes.

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More information:

https://docs.docker.com/storage/volumes/