diff --git a/contrib/zmq/zmq_sub.py b/contrib/zmq/zmq_sub.py
index aa4c660a6b..9c8bb5e9fd 100755
--- a/contrib/zmq/zmq_sub.py
+++ b/contrib/zmq/zmq_sub.py
@@ -41,6 +41,7 @@ class ZMQHandler():
         self.zmqContext = zmq.asyncio.Context()
 
         self.zmqSubSocket = self.zmqContext.socket(zmq.SUB)
+        self.zmqSubSocket.setsockopt(zmq.RCVHWM, 0)
         self.zmqSubSocket.setsockopt_string(zmq.SUBSCRIBE, "hashblock")
         self.zmqSubSocket.setsockopt_string(zmq.SUBSCRIBE, "hashchainlock")
         self.zmqSubSocket.setsockopt_string(zmq.SUBSCRIBE, "hashtx")
diff --git a/doc/zmq.md b/doc/zmq.md
index 69a6072390..b7b93aaf26 100644
--- a/doc/zmq.md
+++ b/doc/zmq.md
@@ -81,10 +81,35 @@ Currently, the following notifications are supported:
 The socket type is PUB and the address must be a valid ZeroMQ socket
 address. The same address can be used in more than one notification.
 
+The option to set the PUB socket's outbound message high water mark
+(SNDHWM) may be set individually for each notification:
+
+    -zmqpubhashtxhwm=n
+    -zmqpubhashblockhwm=n
+    -zmqpubhashchainlockhwm=n
+    -zmqpubhashtxlockhwm=n
+    -zmqpubhashgovernancevotehwm=n
+    -zmqpubhashgovernanceobjecthwm=n
+    -zmqpubhashinstantsenddoublespendhwm=n
+    -zmqpubhashrecoveredsighwm=n
+    -zmqpubrawblockhwm=n
+    -zmqpubrawtxhwm=n
+    -zmqpubrawchainlockhwm=n
+    -zmqpubrawchainlocksighwm=n
+    -zmqpubrawtxlockhwm=n
+    -zmqpubrawtxlocksighwm=n
+    -zmqpubrawgovernancevotehwm=n
+    -zmqpubrawgovernanceobjecthwm=n
+    -zmqpubrawinstantsenddoublespendhwm=n
+    -zmqpubrawrecoveredsighwm=n
+
+The high water mark value must be an integer greater than or equal to 0.
+
 For instance:
 
     $ dashd -zmqpubhashtx=tcp://127.0.0.1:28332 \
-               -zmqpubrawtx=ipc:///tmp/dashd.tx.raw
+               -zmqpubrawtx=ipc:///tmp/dashd.tx.raw \
+               -zmqpubhashtxhwm=10000
 
 Each PUB notification has a topic and body, where the header
 corresponds to the notification type. For instance, for the
diff --git a/src/init.cpp b/src/init.cpp
index a9d7e8e608..2e011b47a4 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -99,6 +99,7 @@
 #include <openssl/crypto.h>
 
 #if ENABLE_ZMQ
+#include <zmq/zmqabstractnotifier.h>
 #include <zmq/zmqnotificationinterface.h>
 #include <zmq/zmqrpc.h>
 #endif
@@ -596,6 +597,24 @@ void SetupServerArgs()
     gArgs.AddArg("-zmqpubrawtx=<address>", "Enable publish raw transaction in <address>", false, OptionsCategory::ZMQ);
     gArgs.AddArg("-zmqpubrawtxlock=<address>", "Enable publish raw transaction (locked via InstantSend) in <address>", false, OptionsCategory::ZMQ);
     gArgs.AddArg("-zmqpubrawtxlocksig=<address>", "Enable publish raw transaction (locked via InstantSend) and ISLOCK in <address>", false, OptionsCategory::ZMQ);
+    gArgs.AddArg("-zmqpubhashblockhwm=<n>", strprintf("Set publish hash block outbound message high water mark (default: %d)", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM), false, OptionsCategory::ZMQ);
+    gArgs.AddArg("-zmqpubhashchainlockhwm=<n>", strprintf("Set publish hash chain lock outbound message high water mark (default: %d)", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM), false, OptionsCategory::ZMQ);
+    gArgs.AddArg("-zmqpubhashgovernanceobjecthwm=<n>", strprintf("Set publish hash governance object outbound message high water mark (default: %d)", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM), false, OptionsCategory::ZMQ);
+    gArgs.AddArg("-zmqpubhashgovernancevotehwm=<n>", strprintf("Set publish hash governance vote outbound message high water mark (default: %d)", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM), false, OptionsCategory::ZMQ);
+    gArgs.AddArg("-zmqpubhashinstantsenddoublespendhwm=<n>", strprintf("Set publish hash InstantSend double spend outbound message high water mark (default: %d)", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM), false, OptionsCategory::ZMQ);
+    gArgs.AddArg("-zmqpubhashrecoveredsighwm=<n>", strprintf("Set publish hash recovered signature outbound message high water mark (default: %d)", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM), false, OptionsCategory::ZMQ);
+    gArgs.AddArg("-zmqpubhashtxhwm=<n>", strprintf("Set publish hash transaction outbound message high water mark (default: %d)", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM), false, OptionsCategory::ZMQ);
+    gArgs.AddArg("-zmqpubhashtxlockhwm=<n>", strprintf("Set publish hash transaction lock outbound message high water mark (default: %d)", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM), false, OptionsCategory::ZMQ);
+    gArgs.AddArg("-zmqpubrawblockhwm=<n>", strprintf("Set publish raw block outbound message high water mark (default: %d)", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM), false, OptionsCategory::ZMQ);
+    gArgs.AddArg("-zmqpubrawchainlockhwm=<n>", strprintf("Set publish raw chain lock outbound message high water mark (default: %d)", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM), false, OptionsCategory::ZMQ);
+    gArgs.AddArg("-zmqpubrawchainlocksighwm=<n>", strprintf("Set publish raw chain lock signature outbound message high water mark (default: %d)", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM), false, OptionsCategory::ZMQ);
+    gArgs.AddArg("-zmqpubrawgovernanceobjecthwm=<n>", strprintf("Set publish raw governance object outbound message high water mark (default: %d)", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM), false, OptionsCategory::ZMQ);
+    gArgs.AddArg("-zmqpubrawgovernancevotehwm=<n>", strprintf("Set publish raw governance vote outbound message high water mark (default: %d)", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM), false, OptionsCategory::ZMQ);
+    gArgs.AddArg("-zmqpubrawinstantsenddoublespendhwm=<n>", strprintf("Set publish raw InstantSend double spend outbound message high water mark (default: %d)", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM), false, OptionsCategory::ZMQ);
+    gArgs.AddArg("-zmqpubrawrecoveredsighwm=<n>", strprintf("Set publish raw recovered signature outbound message high water mark (default: %d)", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM), false, OptionsCategory::ZMQ);
+    gArgs.AddArg("-zmqpubrawtxhwm=<n>", strprintf("Set publish raw transaction outbound message high water mark (default: %d)", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM), false, OptionsCategory::ZMQ);
+    gArgs.AddArg("-zmqpubrawtxlockhwm=<n>", strprintf("Set publish raw transaction lock outbound message high water mark (default: %d)", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM), false, OptionsCategory::ZMQ);
+    gArgs.AddArg("-zmqpubrawtxlocksighwm=<n>", strprintf("Set publish raw transaction lock signature outbound message high water mark (default: %d)", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM), false, OptionsCategory::ZMQ);
 #else
     hidden_args.emplace_back("-zmqpubhashblock=<address>");
     hidden_args.emplace_back("-zmqpubhashchainlock=<address>");
@@ -615,6 +634,24 @@ void SetupServerArgs()
     hidden_args.emplace_back("-zmqpubrawtx=<address>");
     hidden_args.emplace_back("-zmqpubrawtxlock=<address>");
     hidden_args.emplace_back("-zmqpubrawtxlocksig=<address>");
+    hidden_args.emplace_back("-zmqpubhashblockhwm=<n>");
+    hidden_args.emplace_back("-zmqpubhashchainlockhwm=<n>");
+    hidden_args.emplace_back("-zmqpubhashgovernanceobjecthwm=<n>");
+    hidden_args.emplace_back("-zmqpubhashgovernancevotehwm=<n>");
+    hidden_args.emplace_back("-zmqpubhashinstantsenddoublespendhwm=<n>");
+    hidden_args.emplace_back("-zmqpubhashrecoveredsighwm=<n>");
+    hidden_args.emplace_back("-zmqpubhashtxhwm=<n>");
+    hidden_args.emplace_back("-zmqpubhashtxlockhwm=<n>");
+    hidden_args.emplace_back("-zmqpubrawblockhwm=<n>");
+    hidden_args.emplace_back("-zmqpubrawchainlockhwm=<n>");
+    hidden_args.emplace_back("-zmqpubrawchainlocksighwm=<n>");
+    hidden_args.emplace_back("-zmqpubrawgovernanceobjecthwm=<n>");
+    hidden_args.emplace_back("-zmqpubrawgovernancevotehwm=<n>");
+    hidden_args.emplace_back("-zmqpubrawinstantsenddoublespendhwm=<n>");
+    hidden_args.emplace_back("-zmqpubrawrecoveredsighwm=<n>");
+    hidden_args.emplace_back("-zmqpubrawtxhwm=<n>");
+    hidden_args.emplace_back("-zmqpubrawtxlockhwm=<n>");
+    hidden_args.emplace_back("-zmqpubrawtxlocksighwm=<n>");
 #endif
 
     gArgs.AddArg("-checkblockindex", strprintf("Do a full consistency check for mapBlockIndex, setBlockIndexCandidates, chainActive and mapBlocksUnlinked occasionally. (default: %u)", defaultChainParams->DefaultConsistencyChecks()), true, OptionsCategory::DEBUG_TEST);
diff --git a/src/zmq/zmqabstractnotifier.cpp b/src/zmq/zmqabstractnotifier.cpp
index 296570274d..3b51e87fbe 100644
--- a/src/zmq/zmqabstractnotifier.cpp
+++ b/src/zmq/zmqabstractnotifier.cpp
@@ -7,6 +7,8 @@
 
 #include <cassert>
 
+const int CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM;
+
 CZMQAbstractNotifier::~CZMQAbstractNotifier()
 {
     assert(!psocket);
diff --git a/src/zmq/zmqabstractnotifier.h b/src/zmq/zmqabstractnotifier.h
index 7683418454..bb39301f08 100644
--- a/src/zmq/zmqabstractnotifier.h
+++ b/src/zmq/zmqabstractnotifier.h
@@ -29,7 +29,9 @@ using CZMQNotifierFactory = std::unique_ptr<CZMQAbstractNotifier> (*)();
 class CZMQAbstractNotifier
 {
 public:
-    CZMQAbstractNotifier() : psocket(nullptr) { }
+    static const int DEFAULT_ZMQ_SNDHWM {1000};
+
+    CZMQAbstractNotifier() : psocket(nullptr), outbound_message_high_water_mark(DEFAULT_ZMQ_SNDHWM) { }
     virtual ~CZMQAbstractNotifier();
 
     template <typename T>
@@ -42,6 +44,12 @@ public:
     void SetType(const std::string &t) { type = t; }
     std::string GetAddress() const { return address; }
     void SetAddress(const std::string &a) { address = a; }
+    int GetOutboundMessageHighWaterMark() const { return outbound_message_high_water_mark; }
+    void SetOutboundMessageHighWaterMark(const int sndhwm) {
+        if (sndhwm >= 0) {
+            outbound_message_high_water_mark = sndhwm;
+        }
+    }
 
     virtual bool Initialize(void *pcontext) = 0;
     virtual void Shutdown() = 0;
@@ -59,6 +67,7 @@ protected:
     void *psocket;
     std::string type;
     std::string address;
+    int outbound_message_high_water_mark; // aka SNDHWM
 };
 
 #endif // BITCOIN_ZMQ_ZMQABSTRACTNOTIFIER_H
diff --git a/src/zmq/zmqnotificationinterface.cpp b/src/zmq/zmqnotificationinterface.cpp
index 9b78c7adac..9a2808dad0 100644
--- a/src/zmq/zmqnotificationinterface.cpp
+++ b/src/zmq/zmqnotificationinterface.cpp
@@ -64,6 +64,7 @@ CZMQNotificationInterface* CZMQNotificationInterface::Create()
             std::unique_ptr<CZMQAbstractNotifier> notifier = factory();
             notifier->SetType(entry.first);
             notifier->SetAddress(address);
+            notifier->SetOutboundMessageHighWaterMark(static_cast<int>(gArgs.GetArg(arg + "hwm", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM)));
             notifiers.push_back(std::move(notifier));
         }
     }
diff --git a/src/zmq/zmqpublishnotifier.cpp b/src/zmq/zmqpublishnotifier.cpp
index 9b050582d4..0dbc5b60eb 100644
--- a/src/zmq/zmqpublishnotifier.cpp
+++ b/src/zmq/zmqpublishnotifier.cpp
@@ -107,8 +107,18 @@ bool CZMQAbstractPublishNotifier::Initialize(void *pcontext)
             return false;
         }
 
-        int rc = zmq_bind(psocket, address.c_str());
-        if (rc!=0)
+        LogPrint(BCLog::ZMQ, "zmq: Outbound message high water mark for %s at %s is %d\n", type, address, outbound_message_high_water_mark);
+
+        int rc = zmq_setsockopt(psocket, ZMQ_SNDHWM, &outbound_message_high_water_mark, sizeof(outbound_message_high_water_mark));
+        if (rc != 0)
+        {
+            zmqError("Failed to set outbound message high water mark");
+            zmq_close(psocket);
+            return false;
+        }
+
+        rc = zmq_bind(psocket, address.c_str());
+        if (rc != 0)
         {
             zmqError("Failed to bind address");
             zmq_close(psocket);
@@ -151,7 +161,7 @@ void CZMQAbstractPublishNotifier::Shutdown()
 
     if (count == 1)
     {
-        LogPrint(BCLog::ZMQ, "Close socket at address %s\n", address);
+        LogPrint(BCLog::ZMQ, "zmq: Close socket at address %s\n", address);
         int linger = 0;
         zmq_setsockopt(psocket, ZMQ_LINGER, &linger, sizeof(linger));
         zmq_close(psocket);
diff --git a/src/zmq/zmqpublishnotifier.h b/src/zmq/zmqpublishnotifier.h
index 2e97624ac9..6fc488eba4 100644
--- a/src/zmq/zmqpublishnotifier.h
+++ b/src/zmq/zmqpublishnotifier.h
@@ -14,7 +14,7 @@ class CGovernanceObject;
 class CZMQAbstractPublishNotifier : public CZMQAbstractNotifier
 {
 private:
-    uint32_t nSequence; //!< upcounting per message sequence number
+    uint32_t nSequence {0U}; //!< upcounting per message sequence number
 
 public:
 
diff --git a/src/zmq/zmqrpc.cpp b/src/zmq/zmqrpc.cpp
index d5f1619863..66b491427d 100644
--- a/src/zmq/zmqrpc.cpp
+++ b/src/zmq/zmqrpc.cpp
@@ -23,7 +23,8 @@ UniValue getzmqnotifications(const JSONRPCRequest& request)
             "[\n"
             "  {                        (json object)\n"
             "    \"type\": \"pubhashtx\",   (string) Type of notification\n"
-            "    \"address\": \"...\"       (string) Address of the publisher\n"
+            "    \"address\": \"...\",      (string) Address of the publisher\n"
+            "    \"hwm\": n                 (numeric) Outbound message high water mark\n"
             "  },\n"
             "  ...\n"
             "]\n"
@@ -39,6 +40,7 @@ UniValue getzmqnotifications(const JSONRPCRequest& request)
             UniValue obj(UniValue::VOBJ);
             obj.pushKV("type", n->GetType());
             obj.pushKV("address", n->GetAddress());
+            obj.pushKV("hwm", n->GetOutboundMessageHighWaterMark());
             result.push_back(obj);
         }
     }
diff --git a/test/functional/interface_zmq.py b/test/functional/interface_zmq.py
index 79bc98438f..f05751c2a5 100755
--- a/test/functional/interface_zmq.py
+++ b/test/functional/interface_zmq.py
@@ -117,10 +117,10 @@ class ZMQTest (BitcoinTestFramework):
 
         self.log.info("Test the getzmqnotifications RPC")
         assert_equal(self.nodes[0].getzmqnotifications(), [
-            {"type": "pubhashblock", "address": ADDRESS},
-            {"type": "pubhashtx", "address": ADDRESS},
-            {"type": "pubrawblock", "address": ADDRESS},
-            {"type": "pubrawtx", "address": ADDRESS},
+            {"type": "pubhashblock", "address": ADDRESS, "hwm": 1000},
+            {"type": "pubhashtx", "address": ADDRESS, "hwm": 1000},
+            {"type": "pubrawblock", "address": ADDRESS, "hwm": 1000},
+            {"type": "pubrawtx", "address": ADDRESS, "hwm": 1000},
         ])
 
         assert_equal(self.nodes[1].getzmqnotifications(), [])
diff --git a/test/functional/interface_zmq_dash.py b/test/functional/interface_zmq_dash.py
index 4941eaa38a..12b5fb24ef 100755
--- a/test/functional/interface_zmq_dash.py
+++ b/test/functional/interface_zmq_dash.py
@@ -126,6 +126,7 @@ class DashZMQTest (DashTestFramework):
             self.test_chainlock_publishers()
             self.test_instantsend_publishers()
             self.test_governance_publishers()
+            self.test_getzmqnotifications()
         finally:
             # Destroy the ZMQ context.
             self.log.debug("Destroying ZMQ context")
@@ -381,6 +382,24 @@ class DashZMQTest (DashTestFramework):
         # Unsubscribe from governance messages
         self.unsubscribe(governance_publishers)
 
+    def test_getzmqnotifications(self):
+        # Test getzmqnotifications RPC
+        assert_equal(self.nodes[0].getzmqnotifications(), [
+            {"type": "pubhashchainlock", "address": self.address, "hwm": 1000},
+            {"type": "pubhashgovernanceobject", "address": self.address, "hwm": 1000},
+            {"type": "pubhashgovernancevote", "address": self.address, "hwm": 1000},
+            {"type": "pubhashinstantsenddoublespend", "address": self.address, "hwm": 1000},
+            {"type": "pubhashrecoveredsig", "address": self.address, "hwm": 1000},
+            {"type": "pubhashtxlock", "address": self.address, "hwm": 1000},
+            {"type": "pubrawchainlock", "address": self.address, "hwm": 1000},
+            {"type": "pubrawchainlocksig", "address": self.address, "hwm": 1000},
+            {"type": "pubrawgovernanceobject", "address": self.address, "hwm": 1000},
+            {"type": "pubrawgovernancevote", "address": self.address, "hwm": 1000},
+            {"type": "pubrawinstantsenddoublespend", "address": self.address, "hwm": 1000},
+            {"type": "pubrawrecoveredsig", "address": self.address, "hwm": 1000},
+            {"type": "pubrawtxlock", "address": self.address, "hwm": 1000},
+            {"type": "pubrawtxlocksig", "address": self.address, "hwm": 1000},
+        ])
 
 if __name__ == '__main__':
     DashZMQTest().main()