"Rename Mime10 to MIME10 in codebase

Renamed field 'Mime10' to 'MIME10' across multiple files for canonical representation and consistency with standard MIME naming format in the protocol."

eml.go

@@ -21,7 +21,7 @@ func EMLToMsg(fp string) (*Msg, error) {
 		addrHeader:    make(map[AddrHeader][]*nm.Address),
 		genHeader:     make(map[Header][]string),
 		preformHeader: make(map[Header]string),
-		mimever:       Mime10,
+		mimever:       MIME10,
 	}
 
 	pm, mbbuf, err := readEML(fp)

encoding.go

@@ -132,8 +132,8 @@ const (
 
 // List of MIME versions
 const (
-	// Mime10 is the MIME Version 1.0
-	Mime10 MIMEVersion = "1.0"
+	// MIME10 is the MIME Version 1.0
+	MIME10 MIMEVersion = "1.0"
 )
 
 // List of common content types

msg.go

@@ -129,7 +129,7 @@ func NewMsg(o ...MsgOption) *Msg {
 		encoding:      EncodingQP,
 		genHeader:     make(map[Header][]string),
 		preformHeader: make(map[Header]string),
-		mimever:       Mime10,
+		mimever:       MIME10,
 	}
 
 	// Override defaults with optionally provided MsgOption functions

msg_test.go

@@ -137,7 +137,7 @@ func TestNewMsgWithMIMEVersion(t *testing.T) {
 		value MIMEVersion
 		want  MIMEVersion
 	}{
-		{"MIME version is 1.0", Mime10, "1.0"},
+		{"MIME version is 1.0", MIME10, "1.0"},
 	}
 
 	for _, tt := range tests {