contentEncodingToString

the encoding type as a string or null on error. Available values for the encoding are: #GMIME_CONTENT_ENCODING_DEFAULT, #GMIME_CONTENT_ENCODING_7BIT, #GMIME_CONTENT_ENCODING_8BIT, #GMIME_CONTENT_ENCODING_BINARY, #GMIME_CONTENT_ENCODING_BASE64, #GMIME_CONTENT_ENCODING_QUOTEDPRINTABLE and #GMIME_CONTENT_ENCODING_UUENCODE.