diff --git a/src/postmarker/core.py b/src/postmarker/core.py
index 39cd7bd..15d0613 100644
--- a/src/postmarker/core.py
+++ b/src/postmarker/core.py
@@ -10,6 +10,7 @@
 from .models.domains import DomainsManager
 from .models.emails import EmailManager
 from .models.messages import MessageManager
+from .models.message_streams import MessageStreamsManager
 from .models.senders import SenderSignaturesManager
 from .models.server import ServerManager
 from .models.stats import StatsManager
@@ -33,6 +34,7 @@ class PostmarkClient:
         DomainsManager,
         EmailManager,
         MessageManager,
+        MessageStreamsManager,
         SenderSignaturesManager,
         ServerManager,
         StatsManager,
diff --git a/src/postmarker/models/message_streams.py b/src/postmarker/models/message_streams.py
new file mode 100644
index 0000000..0cee2d2
--- /dev/null
+++ b/src/postmarker/models/message_streams.py
@@ -0,0 +1,137 @@
+from .base import Model, ModelManager
+
+
+class MessageStream(Model):
+    def __str__(self):
+        return "{}: {}".format(
+            self.__class__.__name__,
+            self._data.get("ID"),
+        )
+
+    def get(self):
+        new_instance = self._manager.get(self.ID)
+        self._data = new_instance._data
+        return self
+
+    def edit(self, **kwargs):
+        response = self._manager.edit(self.ID, **kwargs)
+        self._update(response)
+
+    def archive(self):
+        return self._manager.archive(self.ID)
+
+    def unarchive(self):
+        return self._manager.unarchive(self.ID)
+
+
+class MessageStreamsManager(ModelManager):
+    name = "message_streams"
+    model = MessageStream
+
+    def get(self, id):
+        response = self.call("GET", "/message-streams/%s" % id)
+        return self._init_instance(response)
+
+    def create(
+        self,
+        ID,
+        Name,
+        MessageStreamType,
+        Description=None,
+        SubscriptionManagementConfiguration=None,
+        UnsubscribeHandlingType=None,
+    ):
+        """Creates a message stream.
+
+        :param ID: The ID of the message stream being created. This is used when sending messages to specify the sending message stream. For example: "transactional-dev"
+        :param Name: Name of message stream
+        :param MessageStreamType: The type of message stream being created. Possible options "Broadcasts" or "Transasctional"
+        :param Description: Optional. A description of the message stream.
+        :param SubscriptionManagementConfiguration: Optional. Subscription management options for the Stream.
+        :param UnsubscribeHandlingType: The unsubscribe management option for the stream. For transactional streams default is None. For broadcast streams default is Postmark. Unsubscribe management is required for broadcast message streams, approved accounts can use Custom. Possible options: "none" "Postmark" "Custom".
+        :return:
+        """
+        assert MessageStreamType in (
+            "Broadcasts",
+            "Transasctional",
+        ), "Provide either email TextBody or HtmlBody or both"
+        data = {
+            "ID": ID,
+            "Name": Name,
+            "MessageStreamType": MessageStreamType,
+            "Description": Description,
+            "SubscriptionManagementConfiguration": SubscriptionManagementConfiguration,
+            "UnsubscribeHandlingType": UnsubscribeHandlingType,
+        }
+        return self._init_instance(self.call("POST", "/message-streams", data=data))
+
+    def edit(
+        self,
+        id,
+        Name=None,
+        Description=None,
+        SubscriptionManagementConfiguration=None,
+        UnsubscribeHandlingType=None,
+    ):
+        data = {}
+
+        if Name is not None:
+            data["Name"] = Name
+
+        if Description is not None:
+            data["Description"] = Description
+
+        if SubscriptionManagementConfiguration is not None:
+            data["SubscriptionManagementConfiguration"] = SubscriptionManagementConfiguration
+
+        if UnsubscribeHandlingType is not None:
+            data["UnsubscribeHandlingType"] = UnsubscribeHandlingType
+
+        return self.call("PATCH", "/message-streams/%s" % id, data=data)
+
+    def all(self, MessageStreamType=None, IncludeArchivedStreams=None):
+        response = self.call(
+            "GET",
+            "/message-streams",
+            MessageStreamType=MessageStreamType,
+            IncludeArchivedStreams=IncludeArchivedStreams,
+        )
+
+        return self._init_many(response["MessageStreams"])
+
+    def archive(self, id):
+        return self.call("POST", "/message-streams/%s/archive" % id)
+
+    def unarchive(self, id):
+        return self.call("PUT", "/message-streams/%s/unarchive" % id)
+
+    def suppressions_dump(
+        self,
+        stream_id,
+        SuppressionReason=None,
+        Origin=None,
+        todate=None,
+        fromdate=None,
+        EmailAddress=None,
+    ):
+        response = self.call(
+            "GET",
+            "/message-streams/%s/suppressions/dump" % stream_id,
+            SuppressionReason=SuppressionReason,
+            Origin=Origin,
+            todate=todate,
+            fromdate=fromdate,
+            EmailAddress=EmailAddress,
+        )
+
+        return response["Suppressions"]
+
+    def suppressions_create(self, stream_id, *email_addresses):
+        data = {"Suppressions": [{"EmailAddress": i} for i in email_addresses]}
+
+        return self.call("POST", "/message-streams/%s/suppressions" % stream_id, data=data)
+
+    def suppressions_delete(self, stream_id, *email_addresses):
+        data = {"Suppressions": [{"EmailAddress": i} for i in email_addresses]}
+
+        return self.call("POST", "/message-streams/%s/suppressions/delete" % stream_id, data=data)
diff --git a/test/models/test_message_streams.py b/test/models/test_message_streams.py
new file mode 100644
index 0000000..d173e6f
--- /dev/null
+++ b/test/models/test_message_streams.py
@@ -0,0 +1,19 @@
+from postmarker.models.message_streams import MessageStream
+
+
+class TestModel:
+    def test_get(self, message_stream):
+        assert isinstance(message_stream, MessageStream)
+
+    def test_repr(self, message_stream):
+        assert repr(message_stream) == "<MessageStream: outbound>"
+
+    def test_activate(self, message_stream):
+        assert message_stream.activate() == "OK"
+
+
+class TestManager:
+    def test_all(self, postmark):
+        message_streams = postmark.message_streams.all()
+        assert len(message_streams) == 2
+        assert all(isinstance(message_stream, MessageStream) for message_stream in message_streams)