Emails from the rfc/ legacy/ malformed/ and thirdparty/ folders were imported from this repository: https://github.com/stalwartlabs/mail-parser Specific COPYING files are available in each folder to trace their authors. If nothing is stated in these folders, the following copyright applies: Copyright (C) 2020-2022, Stalwart Labs Ltd. And the distribution license is either BSD-2, MIT or Apache 2.