diff --git a/rfc5322/validation.go b/rfc5322/validation.go
index 136b2d99..5e149af8 100644
--- a/rfc5322/validation.go
+++ b/rfc5322/validation.go
@@ -58,14 +58,10 @@ func ValidateMessageHeaderFields(literal []byte) error {
 					return fmt.Errorf("%w: Required header field 'Sender' should not be empty", ErrInvalidMessage)
 				}
 
-				senderAddr, err := ParseAddress(senderValue)
+				_, err := ParseAddress(senderValue)
 				if err != nil {
 					return fmt.Errorf("%w: failed to parse Sender header: %v", ErrInvalidMessage, err)
 				}
-
-				if len(senderAddr) == 1 && senderAddr[0].Address == addresses[0].Address {
-					return fmt.Errorf("%w: `Sender` should not be present if equal to `From`", ErrInvalidMessage)
-				}
 			}
 		}
 	}
diff --git a/rfc5322/validation_test.go b/rfc5322/validation_test.go
index 453eccba..835fb899 100644
--- a/rfc5322/validation_test.go
+++ b/rfc5322/validation_test.go
@@ -28,15 +28,6 @@ func TestValidateMessageHeaderFields_ErrOnMissingDate(t *testing.T) {
 	require.Error(t, ValidateMessageHeaderFields([]byte(literal)))
 }
 
-func TestValidateMessageHeaderFields_ErrOnSingleFromAndSenderEqual(t *testing.T) {
-	const literal = `From: Foo@bar.com
-Date: Mon, 7 Feb 1994 21:52:25 -0800 (PST)
-Sender: Foo@bar.com
-`
-
-	require.Error(t, ValidateMessageHeaderFields([]byte(literal)))
-}
-
 func TestValidateMessageHeaderFields_AllowSingleFromWithDifferentSender(t *testing.T) {
 	const literal = `From: Foo@bar.com
 Date: Mon, 7 Feb 1994 21:52:25 -0800 (PST)