eml.go

@@ -180,15 +180,7 @@ func parseEMLBodyParts(parsedMsg *netmail.Message, bodybuf *bytes.Buffer, msg *M
 	// Extract the transfer encoding of the body
 	mediatype, params, err := mime.ParseMediaType(parsedMsg.Header.Get(HeaderContentType.String()))
 	if err != nil {
-		switch {
-		// If no Content-Type header is found, we assume that this is a plain text, 7bit, US-ASCII mail
-		case strings.EqualFold(err.Error(), "mime: no media type"):
-			mediatype = TypeTextPlain.String()
-			params = make(map[string]string)
-			params["charset"] = CharsetASCII.String()
-		default:
-			return fmt.Errorf("failed to extract content type: %w", err)
-		}
+		return fmt.Errorf("failed to extract content type: %w", err)
 	}
 	if value, ok := params["charset"]; ok {
 		msg.SetCharset(Charset(value))

eml_test.go

@@ -14,16 +14,6 @@ import (
 )
 
 const (
-	// RFC 5322 example mail
-	// See: https://datatracker.ietf.org/doc/html/rfc5322#appendix-A.1.1
-	exampleMailRFC5322A11 = `From: John Doe <jdoe@machine.example>
-To: Mary Smith <mary@example.net>
-Subject: Saying Hello
-Date: Fri, 21 Nov 1997 09:55:06 -0600
-Message-ID: <1234@local.machine.example>
-
-This is a message just to say hello.
-So, "Hello".`
 	exampleMailPlainNoEnc = `Date: Wed, 01 Nov 2023 00:00:00 +0000
 MIME-Version: 1.0
 Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
@@ -82,6 +72,18 @@ Cc: <go-mail+cc@go-mail.dev>
 Content-Type: text/plain; charset=UTF-8
 Content-Transfer-Encoding: base64
 
+This plain text body should not be parsed as Base64.
+`
+	exampleMailPlainNoContentType = `Date: Wed, 01 Nov 2023 00:00:00 +0000
+MIME-Version: 1.0
+Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
+Subject: Example mail // plain text without encoding
+User-Agent: go-mail v0.4.0 // https://github.com/wneessen/go-mail
+X-Mailer: go-mail v0.4.0 // https://github.com/wneessen/go-mail
+From: "Toni Tester" <go-mail@go-mail.dev>
+To: <go-mail+test@go-mail.dev>
+Cc: <go-mail+cc@go-mail.dev>
+
 This plain text body should not be parsed as Base64.
 `
 	exampleMailPlainUnknownContentType = `Date: Wed, 01 Nov 2023 00:00:00 +0000
@@ -621,10 +623,6 @@ func TestEMLToMsgFromString(t *testing.T) {
 		enc  string
 		sub  string
 	}{
-		{
-			"RFC5322 A1.1", exampleMailRFC5322A11, "7bit",
-			"Saying Hello",
-		},
 		{
 			"Plain text no encoding (7bit)", exampleMailPlain7Bit, "7bit",
 			"Example mail // plain text without encoding",
@@ -733,6 +731,12 @@ func TestEMLToMsgFromReaderFailing(t *testing.T) {
 		t.Error("EML from Reader with unknown content type was supposed to fail, but didn't")
 	}
 	mailbuf.Reset()
+	mailbuf.WriteString(exampleMailPlainNoContentType)
+	_, err = EMLToMsgFromReader(mailbuf)
+	if err == nil {
+		t.Error("EML from Reader with no content type was supposed to fail, but didn't")
+	}
+	mailbuf.Reset()
 	mailbuf.WriteString(exampleMailPlainUnsupportedTransferEnc)
 	_, err = EMLToMsgFromReader(mailbuf)
 	if err == nil {
@@ -796,6 +800,17 @@ func TestEMLToMsgFromFileFailing(t *testing.T) {
 	if err = os.RemoveAll(tempDir); err != nil {
 		t.Error("failed to remove temp dir:", err)
 	}
+	tempDir, tempFile, err = stringToTempFile(exampleMailPlainNoContentType, "testmail")
+	if err != nil {
+		t.Errorf("failed to write EML string to temp file: %s", err)
+	}
+	_, err = EMLToMsgFromFile(tempFile)
+	if err == nil {
+		t.Error("EML from Reader with no content type was supposed to fail, but didn't")
+	}
+	if err = os.RemoveAll(tempDir); err != nil {
+		t.Error("failed to remove temp dir:", err)
+	}
 	tempDir, tempFile, err = stringToTempFile(exampleMailPlainUnsupportedTransferEnc, "testmail")
 	if err != nil {
 		t.Errorf("failed to write EML string to temp file: %s", err)