fix:字符类型

go.mod

@@ -36,6 +36,7 @@ require (
 	github.com/KyleBanks/depth v1.2.1 // indirect
 	github.com/PuerkitoBio/purell v1.1.1 // indirect
 	github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect
+	github.com/axgle/mahonia v0.0.0-20180208002826-3358181d7394 // indirect
 	github.com/bytedance/sonic v1.9.1 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311 // indirect

go.sum

@@ -61,6 +61,8 @@ github.com/astaxie/beego v1.12.3 h1:SAQkdD2ePye+v8Gn1r4X6IKZM1wd28EyUOVQ3PDSOOQ=
 github.com/astaxie/beego v1.12.3/go.mod h1:p3qIm0Ryx7zeBHLljmd7omloyca1s4yu1a8kM1FkpIA=
 github.com/aws/aws-sdk-go v1.55.5 h1:KKUZBfBoyqy5d3swXyiC7Q76ic40rYcbqH7qjh59kzU=
 github.com/aws/aws-sdk-go v1.55.5/go.mod h1:eRwEWoyTWFMVYVQzKMNHWP5/RV4xIUGMQfXQHfHkpNU=
+github.com/axgle/mahonia v0.0.0-20180208002826-3358181d7394 h1:OYA+5W64v3OgClL+IrOD63t4i/RW7RqrAVl9LTZ9UqQ=
+github.com/axgle/mahonia v0.0.0-20180208002826-3358181d7394/go.mod h1:Q8n74mJTIgjX4RBBcHnJ05h//6/k6foqmgE45jTQtxg=
 github.com/beego/goyaml2 v0.0.0-20130207012346-5545475820dd/go.mod h1:1b+Y/CofkYwXMUU0OhQqGvsY2Bvgr4j6jfT699wyZKQ=
 github.com/beego/x2j v0.0.0-20131220205130-a0352aadc542/go.mod h1:kSeGC/p1AbBiEp5kat81+DSQrZenVBZXklMLaELspWU=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=

utils/mail/charset_reader.go

@@ -6,6 +6,7 @@ import (
 	"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"
 	"io"
 	"strings"
@@ -60,6 +61,7 @@ var charsetMap = map[string]transform.Transformer{
 	"shift_jis":      japanese.ShiftJIS.NewDecoder(),
 	"ks_c_5601-1987": korean.EUCKR.NewDecoder(),
 	"euc-kr":         korean.EUCKR.NewDecoder(),
+	"big5":           traditionalchinese.Big5.NewDecoder(),
 }
 
 // 定义一个自定义的 CharsetReader 函数，它能够处理 gb2312 和 gbk 字符集