diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -604,7 +604,8 @@
 
     // Pass this transaction to node for mempool insertion and relay to peers if
     // flag set to true
-    bool SubmitMemoryPoolAndRelay(std::string &err_string, bool relay);
+    bool SubmitMemoryPoolAndRelay(std::string &err_string, bool relay,
+                                  interfaces::Chain::Lock &locked_chain);
 
     // TODO: Remove "NO_THREAD_SAFETY_ANALYSIS" and replace it with the correct
     // annotation "EXCLUSIVE_LOCKS_REQUIRED(pwallet->cs_wallet)". The annotation
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -2317,11 +2317,13 @@
     for (const std::pair<const int64_t, CWalletTx *> &item : mapSorted) {
         CWalletTx &wtx = *(item.second);
         std::string unused_err_string;
-        wtx.SubmitMemoryPoolAndRelay(unused_err_string, false);
+        wtx.SubmitMemoryPoolAndRelay(unused_err_string, false, locked_chain);
     }
 }
 
-bool CWalletTx::SubmitMemoryPoolAndRelay(std::string &err_string, bool relay) {
+bool CWalletTx::SubmitMemoryPoolAndRelay(
+    std::string &err_string, bool relay,
+    interfaces::Chain::Lock &locked_chain) {
     // Can't relay if wallet is not broadcasting
     if (!pwallet->GetBroadcastTransactions()) {
         return false;
@@ -2330,6 +2332,15 @@
     if (isAbandoned()) {
         return false;
     }
+    // Don't try to submit coinbase transactions. These would fail anyway but
+    // would cause log spam.
+    if (IsCoinBase()) {
+        return false;
+    }
+    // Don't try to submit conflicted or confirmed transactions.
+    if (GetDepthInMainChain(locked_chain) != 0) {
+        return false;
+    }
 
     // Submit transaction to mempool for relay
     pwallet->WalletLogPrintf("Submitting wtx %s to mempool for relay\n",
@@ -2591,13 +2602,15 @@
         // Relay transactions
         for (std::pair<const TxId, CWalletTx> &item : mapWallet) {
             CWalletTx &wtx = item.second;
-            // only rebroadcast unconfirmed txes older than 5 minutes before the
-            // last block was found
+            // Attempt to rebroadcast all txes more than 5 minutes older than
+            // the last block. SubmitMemoryPoolAndRelay() will not rebroadcast
+            // any confirmed or conflicting txs.
             if (wtx.nTimeReceived > m_best_block_time - 5 * 60) {
                 continue;
             }
             std::string unused_err_string;
-            if (wtx.SubmitMemoryPoolAndRelay(unused_err_string, true)) {
+            if (wtx.SubmitMemoryPoolAndRelay(unused_err_string, true,
+                                             *locked_chain)) {
                 ++submitted_tx_count;
             }
         }
@@ -3670,7 +3683,7 @@
 
     if (fBroadcastTransactions) {
         std::string err_string;
-        if (!wtx.SubmitMemoryPoolAndRelay(err_string, true)) {
+        if (!wtx.SubmitMemoryPoolAndRelay(err_string, true, *locked_chain)) {
             WalletLogPrintf("CommitTransaction(): Transaction cannot be "
                             "broadcast immediately, %s\n",
                             err_string);