diff --git a/email_service_client/client/resources.py b/email_service_client/client/resources.py
index 1b4037c..6f940af 100644
--- a/email_service_client/client/resources.py
+++ b/email_service_client/client/resources.py
@@ -76,9 +76,10 @@ def create(self, data: OutgoingEmailRequestPayload) -> List[OutgoingEmailRequest
             ("subject", data["subject"]),
             ("body", data["body"]),
             ("html", data["html"]),
-            ("amp", data["amp"]),
             *[("attachments", attachment) for attachment in data["attachments"]],
         ]
+        if "amp" in data:
+            form_data.append(("amp", data["amp"]))
         encoded_data = requests_toolbelt.MultipartEncoder(fields=form_data)
         return self._session.post(
             self.resource_url,
diff --git a/email_service_client/tests/unit_tests/email_identity_resource_tests.py b/email_service_client/tests/unit_tests/email_identity_resource_tests.py
index 9f1f751..2cde9f2 100644
--- a/email_service_client/tests/unit_tests/email_identity_resource_tests.py
+++ b/email_service_client/tests/unit_tests/email_identity_resource_tests.py
@@ -109,7 +109,7 @@ def test_create(self, multipart_encoder_patch):
                 data={
                     "from_name": "John",
                     "from_address": "john@coengagage.com",
-                    "recipients": [("jane@plivo.com")],
+                    "recipients": ["jane@plivo.com", "kane@plivo.com"],
                     "subject": "test",
                     "body": "hello!",
                     "amp": "",
@@ -127,6 +127,7 @@ def test_create(self, multipart_encoder_patch):
             fields=[
                 ("from_address", "john@coengagage.com"),
                 ("recipients", "jane@plivo.com"),
+                ("recipients", "kane@plivo.com"),
                 ("reply_to", "mridula@coengagedev.com"),
                 ("subject", "test"),
                 ("body", "hello!"),