diff --git a/api/src/main/java/jakarta/mail/internet/InternetAddress.java b/api/src/main/java/jakarta/mail/internet/InternetAddress.java
index 257ef4c4..04bbdcaa 100644
--- a/api/src/main/java/jakarta/mail/internet/InternetAddress.java
+++ b/api/src/main/java/jakarta/mail/internet/InternetAddress.java
@@ -1348,7 +1348,7 @@ private static void checkAddress(String addr,
                             "Local address ends with dot", addr);
                 break;        // done with local part
             }
-            if (c <= 040 || c == 0177)
+            if (c <= 040 || c >= 0177)
                 throw new AddressException(
                         "Local address contains control or whitespace", addr);
             if (specialsNoDot.indexOf(c) >= 0)
diff --git a/api/src/test/java/jakarta/mail/internet/InternetAddressTest.java b/api/src/test/java/jakarta/mail/internet/InternetAddressTest.java
index 069cd363..3e859b3b 100644
--- a/api/src/test/java/jakarta/mail/internet/InternetAddressTest.java
+++ b/api/src/test/java/jakarta/mail/internet/InternetAddressTest.java
@@ -30,6 +30,8 @@
 import java.util.Collection;
 import java.util.List;
 
+import static org.junit.Assert.assertThrows;
+
 /**
  * Test Internet address parsing.
  *
@@ -379,4 +381,28 @@ private static final void pr(String s) {
     private static final String n(String s) {
         return s == null ? "<null>" : s;
     }
+
+    @Test
+    public void testNonASCIICharacterValidation() {
+        // Test cases that should throw AddressException
+        String[] invalidAddresses = {
+                "testächar@something.com",     // ä = 228
+                "tëst@example.com",            // ë = 235
+                "用户@example.com",             // Chinese characters
+                "test@examplé.com"             // é = 233
+        };
+
+        for (String addr : invalidAddresses) {
+            assertThrows(AddressException.class, () -> {
+                new InternetAddress(addr, true);
+            }, "Expected AddressException for strict constructor with address: " + addr);
+
+            assertThrows(AddressException.class, () -> {
+                InternetAddress address = new InternetAddress(addr);
+                address.validate();
+            }, "Expected AddressException for validate() with address: " + addr);
+        }
+    }
+
+
 }