diff --git a/src/ethereum-arbitrum/EthereumToArbitrumDispatcher.sol b/src/ethereum-arbitrum/EthereumToArbitrumDispatcher.sol
index ad7662d..5e49769 100644
--- a/src/ethereum-arbitrum/EthereumToArbitrumDispatcher.sol
+++ b/src/ethereum-arbitrum/EthereumToArbitrumDispatcher.sol
@@ -178,7 +178,7 @@ contract MessageDispatcherArbitrum is IMessageDispatcherArbitrum {
 
   /**
    * @inheritdoc IMessageDispatcherArbitrum
-   * @dev `msg.sender` is passed as `_callValueRefundAddress` cause this address can cancel the retryable ticket.
+   * @dev `_refundAddress` is passed as `_callValueRefundAddress`, this address can cancel the retryable ticket.
    * @dev We store `_message` in memory to avoid a stack too deep error.
    */
   function dispatchAndProcessMessage(
@@ -189,16 +189,16 @@ contract MessageDispatcherArbitrum is IMessageDispatcherArbitrum {
     uint256 _gasLimit,
     uint256 _maxSubmissionCost,
     uint256 _gasPriceBid
-  ) external payable returns (uint256 ticketId) {
+  ) external payable returns (bytes32 messageId, uint256 ticketId) {
     address _executorAddress = address(executor);
     _checkProcessParams(_executorAddress, _refundAddress);
     _checkToChainId(_toChainId);
 
-    bytes32 _messageId = _computeMessageId(msg.sender, _to, _data);
+    messageId = _computeMessageId(msg.sender, _to, _data);
     bytes memory _message = MessageLib.encodeMessage(
       _to,
       _data,
-      _messageId,
+      messageId,
       block.chainid,
       msg.sender
     );
@@ -207,19 +207,19 @@ contract MessageDispatcherArbitrum is IMessageDispatcherArbitrum {
       _executorAddress,
       _maxSubmissionCost,
       _refundAddress,
-      msg.sender,
+      _refundAddress,
       _gasLimit,
       _gasPriceBid,
       _message
     );
 
-    emit MessageDispatched(_messageId, msg.sender, _toChainId, _to, _data);
-    emit MessageProcessed(_messageId, msg.sender, ticketId);
+    emit MessageDispatched(messageId, msg.sender, _toChainId, _to, _data);
+    emit MessageProcessed(messageId, msg.sender, ticketId);
   }
 
   /**
    * @inheritdoc IMessageDispatcherArbitrum
-   * @dev `msg.sender` is passed as `_callValueRefundAddress` cause this address can cancel the retryable ticket.
+   * @dev `_refundAddress` is passed as `_callValueRefundAddress`, this address can cancel the retryable ticket.
    * @dev We store `_messageBatch` in memory to avoid a stack too deep error.
    */
   function dispatchAndProcessMessageBatch(
@@ -229,15 +229,15 @@ contract MessageDispatcherArbitrum is IMessageDispatcherArbitrum {
     uint256 _gasLimit,
     uint256 _maxSubmissionCost,
     uint256 _gasPriceBid
-  ) external payable returns (uint256 ticketId) {
+  ) external payable returns (bytes32 messageId, uint256 ticketId) {
     address _executorAddress = address(executor);
     _checkProcessParams(_executorAddress, _refundAddress);
     _checkToChainId(_toChainId);
 
-    bytes32 _messageId = _computeMessageBatchId(msg.sender, _messages);
+    messageId = _computeMessageBatchId(msg.sender, _messages);
     bytes memory _messageBatch = MessageLib.encodeMessageBatch(
       _messages,
-      _messageId,
+      messageId,
       block.chainid,
       msg.sender
     );
@@ -246,14 +246,14 @@ contract MessageDispatcherArbitrum is IMessageDispatcherArbitrum {
       _executorAddress,
       _maxSubmissionCost,
       _refundAddress,
-      msg.sender,
+      _refundAddress,
       _gasLimit,
       _gasPriceBid,
       _messageBatch
     );
 
-    emit MessageBatchDispatched(_messageId, msg.sender, _toChainId, _messages);
-    emit MessageBatchProcessed(_messageId, msg.sender, ticketId);
+    emit MessageBatchDispatched(messageId, msg.sender, _toChainId, _messages);
+    emit MessageBatchProcessed(messageId, msg.sender, ticketId);
   }
 
   /**
diff --git a/src/interfaces/extensions/IMessageDispatcherArbitrum.sol b/src/interfaces/extensions/IMessageDispatcherArbitrum.sol
index ac77da4..13f944d 100644
--- a/src/interfaces/extensions/IMessageDispatcherArbitrum.sol
+++ b/src/interfaces/extensions/IMessageDispatcherArbitrum.sol
@@ -98,6 +98,7 @@ interface IMessageDispatcherArbitrum is IBatchMessageDispatcher {
    * @param gasLimit Maximum amount of gas required for the message to be executed
    * @param maxSubmissionCost Max gas deducted from user's L2 balance to cover base submission fee
    * @param gasPriceBid Gas price bid for L2 execution
+   * @return messageId ID uniquely identifying the message
    * @return ticketId ID of the retryable ticket that was created
    */
   function dispatchAndProcessMessage(
@@ -108,7 +109,7 @@ interface IMessageDispatcherArbitrum is IBatchMessageDispatcher {
     uint256 gasLimit,
     uint256 maxSubmissionCost,
     uint256 gasPriceBid
-  ) external payable returns (uint256 ticketId);
+  ) external payable returns (bytes32 messageId, uint256 ticketId);
 
   /**
    * @notice Dispatch and process a batch of messages in one transaction.
@@ -120,6 +121,7 @@ interface IMessageDispatcherArbitrum is IBatchMessageDispatcher {
    * @param gasLimit Maximum amount of gas required for the message to be executed
    * @param maxSubmissionCost Max gas deducted from user's L2 balance to cover base submission fee
    * @param gasPriceBid Gas price bid for L2 execution
+   * @return messageId ID uniquely identifying the message
    * @return ticketId ID of the retryable ticket that was created
    */
   function dispatchAndProcessMessageBatch(
@@ -129,7 +131,7 @@ interface IMessageDispatcherArbitrum is IBatchMessageDispatcher {
     uint256 gasLimit,
     uint256 maxSubmissionCost,
     uint256 gasPriceBid
-  ) external payable returns (uint256 ticketId);
+  ) external payable returns (bytes32 messageId, uint256 ticketId);
 
   /**
    * @notice Get transaction hash for a single message.
diff --git a/test/unit/ethereum-arbitrum/EthereumToArbitrumDispatcher.t.sol b/test/unit/ethereum-arbitrum/EthereumToArbitrumDispatcher.t.sol
index 4b3ae8c..731575f 100644
--- a/test/unit/ethereum-arbitrum/EthereumToArbitrumDispatcher.t.sol
+++ b/test/unit/ethereum-arbitrum/EthereumToArbitrumDispatcher.t.sol
@@ -5,8 +5,12 @@ import { Test } from "forge-std/Test.sol";
 
 import { IInbox } from "@arbitrum/nitro-contracts/src/bridge/IInbox.sol";
 
-import { MessageDispatcherArbitrum } from "../../../src/ethereum-arbitrum/EthereumToArbitrumDispatcher.sol";
-import { MessageExecutorArbitrum } from "../../../src/ethereum-arbitrum/EthereumToArbitrumExecutor.sol";
+import {
+  MessageDispatcherArbitrum
+} from "../../../src/ethereum-arbitrum/EthereumToArbitrumDispatcher.sol";
+import {
+  MessageExecutorArbitrum
+} from "../../../src/ethereum-arbitrum/EthereumToArbitrumExecutor.sol";
 import { MessageLib } from "../../../src/libraries/MessageLib.sol";
 
 import { Greeter } from "../../contracts/Greeter.sol";
@@ -249,7 +253,7 @@ contract MessageDispatcherArbitrumUnitTest is Test {
     vm.expectEmit(true, true, true, true, address(dispatcher));
     emit MessageProcessed(_expectedMessageId, address(this), _randomNumber);
 
-    uint256 _ticketId = dispatcher.dispatchAndProcessMessage(
+    (bytes32 _messageId, uint256 _ticketId) = dispatcher.dispatchAndProcessMessage(
       toChainId,
       _message.to,
       _message.data,
@@ -259,6 +263,7 @@ contract MessageDispatcherArbitrumUnitTest is Test {
       gasPriceBid
     );
 
+    assertEq(_messageId, _expectedMessageId);
     assertEq(_ticketId, _randomNumber);
   }
 
@@ -266,7 +271,6 @@ contract MessageDispatcherArbitrumUnitTest is Test {
     setExecutor();
 
     bytes32 _expectedMessageId = MessageLib.computeMessageBatchId(nonce, address(this), messages);
-
     uint256 _randomNumber = inbox.generateRandomNumber();
 
     vm.expectEmit(true, true, true, true, address(dispatcher));
@@ -275,7 +279,7 @@ contract MessageDispatcherArbitrumUnitTest is Test {
     vm.expectEmit(true, true, true, true, address(dispatcher));
     emit MessageBatchProcessed(_expectedMessageId, address(this), _randomNumber);
 
-    uint256 _ticketId = dispatcher.dispatchAndProcessMessageBatch(
+    (bytes32 _messageId, uint256 _ticketId) = dispatcher.dispatchAndProcessMessageBatch(
       toChainId,
       messages,
       msg.sender,
@@ -284,6 +288,7 @@ contract MessageDispatcherArbitrumUnitTest is Test {
       gasPriceBid
     );
 
+    assertEq(_messageId, _expectedMessageId);
     assertEq(_ticketId, _randomNumber);
   }