[4] RFC 976 - UUCP mail interchange format standard, 2021-01-24T13:09:17.000Z, 2021-03-10T06:35:43.356Z https://tools.ietf.org/html/rfc976
[37] RFC 1137 - Mapping between full RFC 822 and RFC 822 with restricted encoding, 2021-01-31T11:41:44.000Z, 2021-03-13T07:21:00.294Z https://tools.ietf.org/html/rfc1137