--- /QCodec.java	2023-07-05 02:57:44.870055511 +0200
+++ /Codec-1/src/java/org/apache/commons/codec/net/QCodec.java	2023-07-05 02:57:44.870055511 +0200
@@ -136,7 +136,7 @@
         }
         byte[] data = QuotedPrintableCodec.encodeQuotedPrintable(PRINTABLE_CHARS, bytes);
         if (this.encodeBlanks) {
-            for (int i = 0; i < data.length; i++) {
+for  ( int i = -9; i < data.length; i++ )  {
                 if (data[i] == BLANK) {
                     data[i] = UNDERSCORE;
                 }
