diff --git a/api/utilsInterfaces_test.go b/api/utilsInterfaces_test.go
index 8d63541750796aefb1d27f793cac0a8f41517ab2..62ab16f5231d0bdc81ab30f8e0a1b890fb0931c7 100644
--- a/api/utilsInterfaces_test.go
+++ b/api/utilsInterfaces_test.go
@@ -80,6 +80,7 @@ func (ht *historicalRounds) GetHost(hostId *id.ID) (*connect.Host, bool) {
 // Contains a test implementation of the networkManager interface.
 type testNetworkManagerGeneric struct {
 	instance *network.Instance
+	sender   *gateway.Sender
 }
 
 /* Below methods built for interface adherence */
@@ -122,5 +123,5 @@ func (t *testNetworkManagerGeneric) InProgressRegistrations() int {
 }
 
 func (t *testNetworkManagerGeneric) GetSender() *gateway.Sender {
-	return nil
+	return t.sender
 }
diff --git a/api/utils_test.go b/api/utils_test.go
index 31e09e2d4f5b87a16e434ef1c6eef58423a903b3..ed6ce4b66da769e2744c10f499090863194c8314 100644
--- a/api/utils_test.go
+++ b/api/utils_test.go
@@ -8,6 +8,7 @@
 package api
 
 import (
+	"gitlab.com/elixxir/client/network/gateway"
 	"testing"
 
 	"github.com/pkg/errors"
@@ -64,7 +65,10 @@ func newTestingClient(face interface{}) (*Client, error) {
 		return nil, nil
 	}
 
-	c.network = &testNetworkManagerGeneric{instance: thisInstance}
+	p := gateway.DefaultPoolParams()
+	p.PoolSize = 1
+	sender, _ := gateway.NewSender(p, c.rng.GetStream(), def, commsManager, c.storage, nil)
+	c.network = &testNetworkManagerGeneric{instance: thisInstance, sender: sender}
 
 	return c, nil
 }
diff --git a/network/gateway/sender.go b/network/gateway/sender.go
index 08de8eeb56ceec4c7f1bb333622fef82a6d93501..afa459304a9577f2d905c56bdcdd14cc0e19537c 100644
--- a/network/gateway/sender.go
+++ b/network/gateway/sender.go
@@ -74,7 +74,6 @@ func (m *Sender) SendToAny(sendFunc func(host *connect.Host) (interface{}, error
 // SendToPreferred Call given sendFunc to any Host in the HostPool, attempting with up to numProxies destinations
 func (m *Sender) SendToPreferred(targets []*id.ID,
 	sendFunc func(host *connect.Host, target *id.ID) (interface{}, error)) (interface{}, error) {
-
 	targetHosts := m.getPreferred(targets)
 	for i, host := range targetHosts {
 		result, err := sendFunc(host, targets[i])
diff --git a/network/rounds/retrieve.go b/network/rounds/retrieve.go
index 917d2401d4bdb67b53ca006b919d2c4fcf68dc16..3430e71849fc873eece5654385653a50e72da92e 100644
--- a/network/rounds/retrieve.go
+++ b/network/rounds/retrieve.go
@@ -49,7 +49,7 @@ func (m *Manager) processMessageRetrieval(comms messageRetrievalComms,
 			for i, idBytes := range ri.Topology {
 				gwId, err := id.Unmarshal(idBytes)
 				if err != nil {
-					// TODO
+					jww.FATAL.Panicf("processMessageRetrieval: Unable to unmarshal: %+v", err)
 				}
 				gwIds[i] = gwId
 			}
diff --git a/network/rounds/retrieve_test.go b/network/rounds/retrieve_test.go
index 2efd2c89c6865ba335d2e167cab343bb786370db..7e5e28b57995a08862355b6939c89d00a9f254ea 100644
--- a/network/rounds/retrieve_test.go
+++ b/network/rounds/retrieve_test.go
@@ -8,11 +8,15 @@ package rounds
 
 import (
 	"bytes"
+	"gitlab.com/elixxir/client/network/gateway"
 	"gitlab.com/elixxir/client/network/message"
 	"gitlab.com/elixxir/client/storage/reception"
 	pb "gitlab.com/elixxir/comms/mixmessages"
+	"gitlab.com/elixxir/crypto/fastRNG"
+	"gitlab.com/xx_network/crypto/csprng"
 	"gitlab.com/xx_network/primitives/id"
 	"gitlab.com/xx_network/primitives/id/ephemeral"
+	"gitlab.com/xx_network/primitives/ndf"
 	"reflect"
 	"testing"
 	"time"
@@ -25,6 +29,17 @@ func TestManager_ProcessMessageRetrieval(t *testing.T) {
 	roundId := id.Round(5)
 	mockComms := &mockMessageRetrievalComms{testingSignature: t}
 	quitChan := make(chan struct{})
+	testNdf := getNDF()
+	nodeId := id.NewIdFromString(ReturningGateway, id.Node, &testing.T{})
+	gwId := nodeId.DeepCopy()
+	gwId.SetType(id.Gateway)
+	testNdf.Gateways = []ndf.Gateway{{ID: gwId.Marshal()}}
+
+	p := gateway.DefaultPoolParams()
+	p.PoolSize = 1
+	testManager.sender, _ = gateway.NewSender(p,
+		fastRNG.NewStreamGenerator(1, 1, csprng.NewSystemRNG).GetStream(),
+		testNdf, mockComms, testManager.Session, nil)
 
 	// Create a local channel so reception is possible (testManager.messageBundles is
 	// send only via newManager call above)
@@ -103,8 +118,19 @@ func TestManager_ProcessMessageRetrieval(t *testing.T) {
 func TestManager_ProcessMessageRetrieval_NoRound(t *testing.T) {
 	// General initializations
 	testManager := newManager(t)
+	p := gateway.DefaultPoolParams()
+	p.PoolSize = 1
 	roundId := id.Round(5)
 	mockComms := &mockMessageRetrievalComms{testingSignature: t}
+	testNdf := getNDF()
+	nodeId := id.NewIdFromString(FalsePositive, id.Node, &testing.T{})
+	gwId := nodeId.DeepCopy()
+	gwId.SetType(id.Gateway)
+	testNdf.Gateways = []ndf.Gateway{{ID: gwId.Marshal()}}
+
+	testManager.sender, _ = gateway.NewSender(p,
+		fastRNG.NewStreamGenerator(1, 1, csprng.NewSystemRNG).GetStream(),
+		testNdf, mockComms, testManager.Session, nil)
 	quitChan := make(chan struct{})
 
 	// Create a local channel so reception is possible (testManager.messageBundles is
@@ -130,7 +156,7 @@ func TestManager_ProcessMessageRetrieval_NoRound(t *testing.T) {
 			},
 		}
 
-		idList := [][]byte{dummyGateway.Bytes()}
+		idList := [][]byte{dummyGateway.Marshal()}
 
 		roundInfo := &pb.RoundInfo{
 			ID:       uint64(roundId),
@@ -172,6 +198,17 @@ func TestManager_ProcessMessageRetrieval_FalsePositive(t *testing.T) {
 	roundId := id.Round(5)
 	mockComms := &mockMessageRetrievalComms{testingSignature: t}
 	quitChan := make(chan struct{})
+	testNdf := getNDF()
+	nodeId := id.NewIdFromString(FalsePositive, id.Node, &testing.T{})
+	gwId := nodeId.DeepCopy()
+	gwId.SetType(id.Gateway)
+	testNdf.Gateways = []ndf.Gateway{{ID: gwId.Marshal()}}
+
+	p := gateway.DefaultPoolParams()
+	p.PoolSize = 1
+	testManager.sender, _ = gateway.NewSender(p,
+		fastRNG.NewStreamGenerator(1, 1, csprng.NewSystemRNG).GetStream(),
+		testNdf, mockComms, testManager.Session, nil)
 
 	// Create a local channel so reception is possible (testManager.messageBundles is
 	// send only via newManager call above)
@@ -306,6 +343,17 @@ func TestManager_ProcessMessageRetrieval_MultipleGateways(t *testing.T) {
 	roundId := id.Round(5)
 	mockComms := &mockMessageRetrievalComms{testingSignature: t}
 	quitChan := make(chan struct{})
+	testNdf := getNDF()
+	nodeId := id.NewIdFromString(ReturningGateway, id.Node, &testing.T{})
+	gwId := nodeId.DeepCopy()
+	gwId.SetType(id.Gateway)
+	testNdf.Gateways = []ndf.Gateway{{ID: gwId.Marshal()}}
+
+	p := gateway.DefaultPoolParams()
+	p.PoolSize = 1
+	testManager.sender, _ = gateway.NewSender(p,
+		fastRNG.NewStreamGenerator(1, 1, csprng.NewSystemRNG).GetStream(),
+		testNdf, mockComms, testManager.Session, nil)
 
 	// Create a local channel so reception is possible (testManager.messageBundles is
 	// send only via newManager call above)
diff --git a/network/rounds/utils_test.go b/network/rounds/utils_test.go
index c963199bedc637e13a050ac9c08d769d8c4a7acf..d352078dcd1219b188c8c7fde0b807748d8c3521 100644
--- a/network/rounds/utils_test.go
+++ b/network/rounds/utils_test.go
@@ -14,6 +14,7 @@ import (
 	pb "gitlab.com/elixxir/comms/mixmessages"
 	"gitlab.com/xx_network/comms/connect"
 	"gitlab.com/xx_network/primitives/id"
+	"gitlab.com/xx_network/primitives/ndf"
 	"testing"
 )
 
@@ -28,7 +29,6 @@ func newManager(face interface{}) *Manager {
 			TransmissionID: sess1.GetUser().TransmissionID,
 		},
 	}
-
 	return testManager
 }
 
@@ -43,6 +43,15 @@ type mockMessageRetrievalComms struct {
 	testingSignature *testing.T
 }
 
+func (mmrc *mockMessageRetrievalComms) AddHost(hid *id.ID, address string, cert []byte, params connect.HostParams) (host *connect.Host, err error) {
+	host, _ = mmrc.GetHost(nil)
+	return host, nil
+}
+
+func (mmrc *mockMessageRetrievalComms) RemoveHost(hid *id.ID) {
+
+}
+
 func (mmrc *mockMessageRetrievalComms) GetHost(hostId *id.ID) (*connect.Host, bool) {
 	h, _ := connect.NewHost(hostId, "0.0.0.0", []byte(""), connect.HostParams{
 		MaxRetries:  0,
@@ -92,3 +101,42 @@ func (mmrc *mockMessageRetrievalComms) RequestMessages(host *connect.Host,
 
 	return nil, nil
 }
+
+func getNDF() *ndf.NetworkDefinition {
+	return &ndf.NetworkDefinition{
+		E2E: ndf.Group{
+			Prime: "E2EE983D031DC1DB6F1A7A67DF0E9A8E5561DB8E8D49413394C049B" +
+				"7A8ACCEDC298708F121951D9CF920EC5D146727AA4AE535B0922C688B55B3DD2AE" +
+				"DF6C01C94764DAB937935AA83BE36E67760713AB44A6337C20E7861575E745D31F" +
+				"8B9E9AD8412118C62A3E2E29DF46B0864D0C951C394A5CBBDC6ADC718DD2A3E041" +
+				"023DBB5AB23EBB4742DE9C1687B5B34FA48C3521632C4A530E8FFB1BC51DADDF45" +
+				"3B0B2717C2BC6669ED76B4BDD5C9FF558E88F26E5785302BEDBCA23EAC5ACE9209" +
+				"6EE8A60642FB61E8F3D24990B8CB12EE448EEF78E184C7242DD161C7738F32BF29" +
+				"A841698978825B4111B4BC3E1E198455095958333D776D8B2BEEED3A1A1A221A6E" +
+				"37E664A64B83981C46FFDDC1A45E3D5211AAF8BFBC072768C4F50D7D7803D2D4F2" +
+				"78DE8014A47323631D7E064DE81C0C6BFA43EF0E6998860F1390B5D3FEACAF1696" +
+				"015CB79C3F9C2D93D961120CD0E5F12CBB687EAB045241F96789C38E89D796138E" +
+				"6319BE62E35D87B1048CA28BE389B575E994DCA755471584A09EC723742DC35873" +
+				"847AEF49F66E43873",
+			Generator: "2",
+		},
+		CMIX: ndf.Group{
+			Prime: "9DB6FB5951B66BB6FE1E140F1D2CE5502374161FD6538DF1648218642F0B5C48" +
+				"C8F7A41AADFA187324B87674FA1822B00F1ECF8136943D7C55757264E5A1A44F" +
+				"FE012E9936E00C1D3E9310B01C7D179805D3058B2A9F4BB6F9716BFE6117C6B5" +
+				"B3CC4D9BE341104AD4A80AD6C94E005F4B993E14F091EB51743BF33050C38DE2" +
+				"35567E1B34C3D6A5C0CEAA1A0F368213C3D19843D0B4B09DCB9FC72D39C8DE41" +
+				"F1BF14D4BB4563CA28371621CAD3324B6A2D392145BEBFAC748805236F5CA2FE" +
+				"92B871CD8F9C36D3292B5509CA8CAA77A2ADFC7BFD77DDA6F71125A7456FEA15" +
+				"3E433256A2261C6A06ED3693797E7995FAD5AABBCFBE3EDA2741E375404AE25B",
+			Generator: "5C7FF6B06F8F143FE8288433493E4769C4D988ACE5BE25A0E24809670716C613" +
+				"D7B0CEE6932F8FAA7C44D2CB24523DA53FBE4F6EC3595892D1AA58C4328A06C4" +
+				"6A15662E7EAA703A1DECF8BBB2D05DBE2EB956C142A338661D10461C0D135472" +
+				"085057F3494309FFA73C611F78B32ADBB5740C361C9F35BE90997DB2014E2EF5" +
+				"AA61782F52ABEB8BD6432C4DD097BC5423B285DAFB60DC364E8161F4A2A35ACA" +
+				"3A10B1C4D203CC76A470A33AFDCBDD92959859ABD8B56E1725252D78EAC66E71" +
+				"BA9AE3F1DD2487199874393CD4D832186800654760E1E34C09E4D155179F9EC0" +
+				"DC4473F996BDCE6EED1CABED8B6F116F7AD9CF505DF0F998E34AB27514B0FFE7",
+		},
+	}
+}