Fee requirement only applies to txs with OP_RETURN

src/miner.cpp

@@ -539,7 +539,7 @@ CBlockTemplate* CreateNewBlock(CPubKey _pk,const CScript& _scriptPubKeyIn, int32
                     }
                 }
 
-                if (nTxFees < opretMinFee) {
+                if (nTxOpretSize > 0 && nTxFees < opretMinFee) {
                     fSpamTx = true;
                     std::cerr << __func__ << ": " << tx.GetHash().ToString() << " nTxSize=" << nTxSize << " nTxOpretSize=" << nTxOpretSize << " feeRate=" << feeRate.ToString() << " opretMinFee=" << opretMinFee << " nTxFees=" << nTxFees <<" fSpamTx=" << fSpamTx << std::endl;
                     continue;