diff --git a/core/src/main/java/haveno/core/trade/TradeManager.java b/core/src/main/java/haveno/core/trade/TradeManager.java
index fb35ca7809..85a286f5c9 100644
--- a/core/src/main/java/haveno/core/trade/TradeManager.java
+++ b/core/src/main/java/haveno/core/trade/TradeManager.java
@@ -47,14 +47,19 @@ import haveno.core.provider.price.PriceFeedService;
 import haveno.core.support.dispute.arbitration.arbitrator.Arbitrator;
 import haveno.core.support.dispute.arbitration.arbitrator.ArbitratorManager;
 import haveno.core.support.dispute.mediation.mediator.MediatorManager;
+import haveno.core.support.dispute.messages.DisputeClosedMessage;
+import haveno.core.support.dispute.messages.DisputeOpenedMessage;
 import haveno.core.trade.Trade.DisputeState;
 import haveno.core.trade.Trade.Phase;
 import haveno.core.trade.failed.FailedTradesManager;
 import haveno.core.trade.handlers.TradeResultHandler;
 import haveno.core.trade.messages.DepositRequest;
 import haveno.core.trade.messages.DepositResponse;
+import haveno.core.trade.messages.DepositsConfirmedMessage;
 import haveno.core.trade.messages.InitMultisigRequest;
 import haveno.core.trade.messages.InitTradeRequest;
+import haveno.core.trade.messages.PaymentReceivedMessage;
+import haveno.core.trade.messages.PaymentSentMessage;
 import haveno.core.trade.messages.SignContractRequest;
 import haveno.core.trade.messages.SignContractResponse;
 import haveno.core.trade.messages.TradeMessage;
@@ -80,6 +85,8 @@ import haveno.network.p2p.DecryptedMessageWithPubKey;
 import haveno.network.p2p.NodeAddress;
 import haveno.network.p2p.P2PService;
 import haveno.network.p2p.SendMailboxMessageListener;
+import haveno.network.p2p.mailbox.MailboxMessage;
+import haveno.network.p2p.mailbox.MailboxMessageService;
 import haveno.network.p2p.network.TorNetworkNode;
 import javafx.beans.property.BooleanProperty;
 import javafx.beans.property.LongProperty;
@@ -100,6 +107,8 @@ import javax.annotation.Nullable;
 import javax.inject.Inject;
 import java.math.BigInteger;
 import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Comparator;
 import java.util.Date;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -153,6 +162,31 @@ public class TradeManager implements PersistedDataHost, DecryptedDirectMessageLi
     private final LongProperty numPendingTrades = new SimpleLongProperty();
     private final ReferralIdService referralIdService;
 
+    // set comparator for processing mailbox messages
+    static {
+        MailboxMessageService.setMailboxMessageComparator(new MailboxMessageComparator());
+    }
+
+    /**
+     * Sort mailbox messages for processing.
+     */
+    public static class MailboxMessageComparator implements Comparator<MailboxMessage> {
+        private static List<Class<? extends MailboxMessage>> messageOrder = Arrays.asList(
+            AckMessage.class,
+            DepositsConfirmedMessage.class,
+            PaymentSentMessage.class,
+            PaymentReceivedMessage.class,
+            DisputeOpenedMessage.class,
+            DisputeClosedMessage.class);
+
+        @Override
+        public int compare(MailboxMessage m1, MailboxMessage m2) {
+            int idx1 = messageOrder.indexOf(m1.getClass());
+            int idx2 = messageOrder.indexOf(m2.getClass());
+            return idx1 - idx2;
+        }
+    }
+
 
     ///////////////////////////////////////////////////////////////////////////////////////////
     // Constructor
diff --git a/core/src/main/java/haveno/core/trade/protocol/TradeProtocol.java b/core/src/main/java/haveno/core/trade/protocol/TradeProtocol.java
index 3e761334d8..84487fbac6 100644
--- a/core/src/main/java/haveno/core/trade/protocol/TradeProtocol.java
+++ b/core/src/main/java/haveno/core/trade/protocol/TradeProtocol.java
@@ -24,14 +24,13 @@ import haveno.common.crypto.PubKeyRing;
 import haveno.common.handlers.ErrorMessageHandler;
 import haveno.common.proto.network.NetworkEnvelope;
 import haveno.common.taskrunner.Task;
-import haveno.core.support.dispute.messages.DisputeClosedMessage;
-import haveno.core.support.dispute.messages.DisputeOpenedMessage;
 import haveno.core.trade.ArbitratorTrade;
 import haveno.core.trade.BuyerTrade;
 import haveno.core.trade.HavenoUtils;
 import haveno.core.trade.SellerTrade;
 import haveno.core.trade.Trade;
 import haveno.core.trade.TradeManager;
+import haveno.core.trade.TradeManager.MailboxMessageComparator;
 import haveno.core.trade.handlers.TradeResultHandler;
 import haveno.core.trade.messages.DepositRequest;
 import haveno.core.trade.messages.DepositResponse;
@@ -70,11 +69,8 @@ import lombok.extern.slf4j.Slf4j;
 import org.fxmisc.easybind.EasyBind;
 
 import javax.annotation.Nullable;
-import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
-import java.util.Comparator;
-import java.util.List;
 import java.util.concurrent.CountDownLatch;
 
 @Slf4j
@@ -93,11 +89,6 @@ public abstract class TradeProtocol implements DecryptedDirectMessageListener, D
 
     private int reprocessPaymentReceivedMessageCount;
 
-    // set comparator for processing mailbox messages
-    static {
-        MailboxMessageService.setMailboxMessageComparator(new MailboxMessageComparator());
-    }
-
     ///////////////////////////////////////////////////////////////////////////////////////////
     // Constructor
     ///////////////////////////////////////////////////////////////////////////////////////////
@@ -184,23 +175,6 @@ public abstract class TradeProtocol implements DecryptedDirectMessageListener, D
                 .forEach(this::handleMailboxMessage);
     }
 
-    public static class MailboxMessageComparator implements Comparator<MailboxMessage> {
-        private static List<Class<? extends MailboxMessage>> messageOrder = Arrays.asList(
-            AckMessage.class,
-            DepositsConfirmedMessage.class,
-            PaymentSentMessage.class,
-            PaymentReceivedMessage.class,
-            DisputeOpenedMessage.class,
-            DisputeClosedMessage.class);
-
-        @Override
-        public int compare(MailboxMessage m1, MailboxMessage m2) {
-            int idx1 = messageOrder.indexOf(m1.getClass());
-            int idx2 = messageOrder.indexOf(m2.getClass());
-            return idx1 - idx2;
-        }
-    }
-
     private void handleMailboxMessage(MailboxMessage mailboxMessage) {
         if (mailboxMessage instanceof TradeMessage) {
             TradeMessage tradeMessage = (TradeMessage) mailboxMessage;