IMTA can convert various nonstandard message formats to MIME via the Yes CHARSET-CONVERSION. In particular, the RFC 1154 format uses a nonstandard Encoding: header. However, some gateways emit incorrect information on this header line, with the result that sometimes it is desirable to ignore this header. The ignoreencoding keyword instructs the IMTA to ignore any Encoding: header.
Note - Unless the IMTA has a CHARSET-CONVERSION enabled, such headers are ignored in any case. The interpretencoding keyword instructs the IMTA to pay attention to any Encoding: header, if otherwise configured to do so, and is the default.