diff --git a/system_tests/full_challenge_impl_test.go b/system_tests/full_challenge_impl_test.go
index 97deb199b1..29b1252de4 100644
--- a/system_tests/full_challenge_impl_test.go
+++ b/system_tests/full_challenge_impl_test.go
@@ -184,6 +184,7 @@ func makeBatch(t *testing.T, l2Node *arbnode.Node, l2Info *BlockchainTestInfo, b
 }
 
 func confirmLatestBlock(ctx context.Context, t *testing.T, l1Info *BlockchainTestInfo, backend arbutil.L1Interface) {
+	t.Helper()
 	// With SimulatedBeacon running in on-demand block production mode, the
 	// finalized block is considered to be be the nearest multiple of 32 less
 	// than or equal to the block number.
diff --git a/system_tests/unsupported_txtypes_test.go b/system_tests/unsupported_txtypes_test.go
new file mode 100644
index 0000000000..4c3c8661c8
--- /dev/null
+++ b/system_tests/unsupported_txtypes_test.go
@@ -0,0 +1,133 @@
+// Copyright 2021-2022, Offchain Labs, Inc.
+// For license information, see https://github.com/nitro/blob/master/LICENSE
+
+// race detection makes things slow and miss timeouts
+//go:build !race
+// +build !race
+
+package arbtest
+
+import (
+	"context"
+	"errors"
+	"math/big"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/params"
+	"github.com/holiman/uint256"
+)
+
+func TestBlobAndInternalTxsReject(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	builder := NewNodeBuilder(ctx).DefaultConfig(t, false)
+	cleanup := builder.Build(t)
+	defer cleanup()
+
+	builder.L2Info.GenerateAccount("User")
+	builder.L2Info.GenerateAccount("User2")
+	l2ChainID := builder.L2Info.Signer.ChainID()
+
+	privKey := GetTestKeyForAccountName(t, "User")
+	txDataBlob := &types.BlobTx{
+		ChainID:   &uint256.Int{l2ChainID.Uint64()},
+		Nonce:     0,
+		GasFeeCap: &uint256.Int{params.GWei},
+		Gas:       500000,
+		To:        builder.L2Info.GetAddress("User2"),
+		Value:     &uint256.Int{0},
+	}
+	blobTx, err := types.SignNewTx(privKey, types.NewCancunSigner(l2ChainID), txDataBlob)
+	Require(t, err)
+	err = builder.L2.Client.SendTransaction(ctx, blobTx)
+	if err == nil && !errors.Is(err, types.ErrTxTypeNotSupported) {
+		t.Fatalf("did not receive expected error when submitting blob transaction. Want: %v, Got: %v", types.ErrTxTypeNotSupported, err)
+	}
+
+	txDataInternal := &types.ArbitrumInternalTx{ChainId: l2ChainID}
+	internalTx := types.NewTx(txDataInternal)
+	err = builder.L2.Client.SendTransaction(ctx, internalTx)
+	if err == nil && !errors.Is(err, types.ErrTxTypeNotSupported) {
+		t.Fatalf("did not receive expected error when submitting arbitrum internal transaction. Want: %v, Got: %v", types.ErrTxTypeNotSupported, err)
+	}
+}
+func TestBlobAndInternalTxsAsDelayedMsgReject(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	builder := NewNodeBuilder(ctx).DefaultConfig(t, true)
+	cleanup := builder.Build(t)
+	defer cleanup()
+
+	builder.L2Info.GenerateAccount("User2")
+
+	l1Txs := make([]*types.Transaction, 0, 4)
+	txAcceptStatus := make(map[common.Hash]bool, 4)
+	l2ChainID := builder.L2Info.Signer.ChainID()
+
+	privKey := GetTestKeyForAccountName(t, "Owner")
+	txDataBlob := &types.BlobTx{
+		ChainID:   &uint256.Int{l2ChainID.Uint64()},
+		Nonce:     0,
+		GasFeeCap: &uint256.Int{params.GWei},
+		Gas:       500000,
+		To:        builder.L2Info.GetAddress("User2"),
+		Value:     &uint256.Int{0},
+	}
+	delayedBlobTx, err := types.SignNewTx(privKey, types.NewCancunSigner(l2ChainID), txDataBlob)
+	Require(t, err)
+	txAcceptStatus[delayedBlobTx.Hash()] = false
+	l1TxBlob := WrapL2ForDelayed(t, delayedBlobTx, builder.L1Info, "User", 100000)
+	l1Txs = append(l1Txs, l1TxBlob)
+
+	txDataInternal := &types.ArbitrumInternalTx{ChainId: l2ChainID}
+	delayedInternalTx := types.NewTx(txDataInternal)
+	txAcceptStatus[delayedInternalTx.Hash()] = false
+	l1TxInternal := WrapL2ForDelayed(t, delayedInternalTx, builder.L1Info, "User", 100000)
+	l1Txs = append(l1Txs, l1TxInternal)
+
+	delayedTx1 := builder.L2Info.PrepareTx("Owner", "User2", 50001, big.NewInt(10000), nil)
+	txAcceptStatus[delayedTx1.Hash()] = false
+	l1tx := WrapL2ForDelayed(t, delayedTx1, builder.L1Info, "User", 100000)
+	l1Txs = append(l1Txs, l1tx)
+
+	delayedTx2 := builder.L2Info.PrepareTx("Owner", "User2", 50001, big.NewInt(10000), nil)
+	txAcceptStatus[delayedTx2.Hash()] = false
+	l1tx = WrapL2ForDelayed(t, delayedTx2, builder.L1Info, "User", 100000)
+	l1Txs = append(l1Txs, l1tx)
+
+	errs := builder.L1.L1Backend.TxPool().Add(l1Txs, true, false)
+	for _, err := range errs {
+		Require(t, err)
+	}
+
+	confirmLatestBlock(ctx, t, builder.L1Info, builder.L1.Client)
+	for _, tx := range l1Txs {
+		_, err = builder.L1.EnsureTxSucceeded(tx)
+		Require(t, err)
+	}
+
+	blocknum, err := builder.L2.Client.BlockNumber(ctx)
+	Require(t, err)
+	for i := int64(0); i <= int64(blocknum); i++ {
+		block, err := builder.L2.Client.BlockByNumber(ctx, big.NewInt(i))
+		Require(t, err)
+		for _, tx := range block.Transactions() {
+			if _, ok := txAcceptStatus[tx.Hash()]; ok {
+				txAcceptStatus[tx.Hash()] = true
+			}
+		}
+	}
+	if !txAcceptStatus[delayedTx1.Hash()] || !txAcceptStatus[delayedTx2.Hash()] {
+		t.Fatalf("transaction of valid transaction type wasn't accepted as a delayed message")
+	}
+	if txAcceptStatus[delayedBlobTx.Hash()] {
+		t.Fatalf("blob transaction was successfully accepted as a delayed message")
+	}
+	if txAcceptStatus[delayedInternalTx.Hash()] {
+		t.Fatalf("arbitrum internal transaction was successfully accepted as a delayed message")
+	}
+}