diff --git a/src/libraries/System.Net.Mail/src/System/Net/Mail/MailAddress.cs b/src/libraries/System.Net.Mail/src/System/Net/Mail/MailAddress.cs
index d8a5d0c92fdbf4..9c076fa0106f6d 100644
--- a/src/libraries/System.Net.Mail/src/System/Net/Mail/MailAddress.cs
+++ b/src/libraries/System.Net.Mail/src/System/Net/Mail/MailAddress.cs
@@ -272,7 +272,7 @@ public override bool Equals(object? value)
 
         public override int GetHashCode()
         {
-            return ToString().GetHashCode();
+            return ToString().GetHashCode(StringComparison.InvariantCultureIgnoreCase);
         }
 
         private static readonly EncodedStreamFactory s_encoderFactory = new EncodedStreamFactory();
diff --git a/src/libraries/System.Net.Mail/tests/Functional/MailAddressTest.cs b/src/libraries/System.Net.Mail/tests/Functional/MailAddressTest.cs
index a695c4c62a3cf7..9abfcabd3cf628 100644
--- a/src/libraries/System.Net.Mail/tests/Functional/MailAddressTest.cs
+++ b/src/libraries/System.Net.Mail/tests/Functional/MailAddressTest.cs
@@ -194,6 +194,22 @@ public void EqualsTest2()
             Assert.Equal(n, n2);
         }
 
+        [Fact]
+        public void GetHashCodeTest()
+        {
+            var n = new MailAddress("Mr. Bar <a@example.com>");
+            var n2 = new MailAddress("a@example.com", "Mr. Bar");
+            Assert.Equal(n.GetHashCode(), n2.GetHashCode());
+        }
+
+        [Fact]
+        public void GetHashCodeTest2()
+        {
+            var n = new MailAddress("Mr. Bar <a@example.com>");
+            var n2 = new MailAddress("MR. BAR <a@EXAMPLE.com>");
+            Assert.Equal(n.GetHashCode(), n2.GetHashCode());
+        }
+
         [Theory]
         [MemberData(nameof(GetInvalid_Address))]
         public void TryCreate_Invalid_Address(string address)