Imports
- git.maildev.jp/tachibana/go-message/message/enc
- golang.org/x/text/encoding/charmap
- golang.org/x/text/encoding/japanese
- golang.org/x/text/encoding/korean
- golang.org/x/text/encoding/simplifiedchinese
- golang.org/x/text/encoding/traditionalchinese
- golang.org/x/text/transform