Return full Postmark API response from send() and add tests

postmark/core.py

@@ -504,7 +504,7 @@ def to_json_message(self):
 
         return json_message
 
-    def send(self, test=None):
+    def send(self, test=None, return_json=None):
         '''
         Send the email through the Postmark system.
         Pass test=True to just print out the resulting
@@ -537,6 +537,21 @@ def send(self, test=None):
         else:
             endpoint_url = __POSTMARK_URL__ + 'email'
 
+        """
+        Args:
+            return_json (bool | None):
+                True  -> return parsed JSON
+                False -> return True/False
+                None  -> fallback to settings.POSTMARK_RETURN_JSON (default False)
+        """
+
+        if return_json is None:
+            try:
+                from django.conf import settings as django_settings
+                return_json = getattr(django_settings, "POSTMARK_RETURN_JSON", False)
+            except ImportError:
+                return_json = False
+
         # Set up the url Request
         req = Request(
             endpoint_url,
@@ -556,8 +571,9 @@ def send(self, test=None):
             jsontxt = result.read().decode('utf8')
             result.close()
             if result.code == 200:
-                self.message_id = json.loads(jsontxt).get('MessageID', None)
-                return True
+                parsed = json.loads(jsontxt)
+                self.message_id = parsed.get("MessageID", None)
+                return parsed if return_json else True
             else:
                 raise PMMailSendException('Return code %d: %s' % (result.code, result.msg))
         except HTTPError as err:
@@ -676,7 +692,7 @@ def _check_values(self):
 
             message._check_values()
 
-    def send(self, test=None):
+    def send(self, test=None, return_json=None):
         # Has one of the messages caused an inactive recipient error?
         inactive_recipient = False
 
@@ -691,6 +707,21 @@ def send(self, test=None):
             except ImportError:
                 pass
 
+        """
+        Args:
+            return_json (bool | None):
+                True  -> return parsed JSON
+                False -> return True/False
+                None  -> fallback to settings.POSTMARK_RETURN_JSON (default False)
+        """
+
+        if return_json is None:
+            try:
+                from django.conf import settings as django_settings
+                return_json = getattr(django_settings, "POSTMARK_RETURN_JSON", False)
+            except ImportError:
+                return_json = False
+
         # Split up into groups of 500 messages for sending
         for messages in _chunks(self.messages, PMBatchMail.MAX_MESSAGES):
             json_message = []
@@ -729,6 +760,7 @@ def send(self, test=None):
                     results = json.loads(jsontxt)
                     for i, res in enumerate(results):
                         self.__messages[i].message_id = res.get("MessageID", None)
+                    return results if return_json else True
                 else:
                     raise PMMailSendException('Return code %d: %s' % (result.code, result.msg))
             except HTTPError as err:

tests.py

@@ -20,6 +20,8 @@
 
 import mock
 
+from unittest.mock import MagicMock
+
 from postmark import (
     PMBatchMail, PMMail, PMMailInactiveRecipientException,
     PMMailUnprocessableEntityException, PMMailServerErrorException,
@@ -29,6 +31,15 @@
 from django.conf import settings
 
 
+def make_fake_response(payload, code=200):
+    """Helper to fake an HTTP response object."""
+    mock = MagicMock()
+    mock.code = code
+    mock.read.return_value = json.dumps(payload).encode("utf-8")
+    mock.close.return_value = None
+    return mock
+
+
 class PMMailTests(unittest.TestCase):
     def test_406_error_inactive_recipient(self):
         json_payload = BytesIO()
@@ -181,6 +192,37 @@ def test_send_metadata_invalid_format(self):
         self.assertRaises(TypeError, PMMail, api_key='test', sender='from@example.com', to='to@example.com',
                          subject='test', text_body='test', metadata={'test': {}})
 
+    def test_mail_returns_result(self):
+        fake_payload = {
+            "To": "receiver@example.com",
+            "SubmittedAt": "2025-09-18T10:00:00Z",
+            "MessageID": "abc-123",
+            "ErrorCode": 0,
+            "Message": "OK"
+        }
+
+        mail = PMMail(
+            api_key="test-api-key",
+            sender="sender@example.com",
+            to="receiver@example.com",
+            subject="Hello",
+            text_body="Testing single mail return",
+        )
+
+        with mock.patch("postmark.core.urlopen") as mock_urlopen:
+            mock_urlopen.return_value = make_fake_response(fake_payload)
+
+            # Test boolean return
+            result = mail.send()
+            self.assertTrue(result)
+
+            # Test JSON return explicitly
+            result_json = mail.send(return_json=True)
+            self.assertIsInstance(result_json, dict)
+            self.assertEqual(result_json["ErrorCode"], 0)
+            self.assertEqual(result_json["Message"], "OK")
+
+
 
 class PMBatchMailTests(unittest.TestCase):
     def test_406_error_inactive_recipient(self):
@@ -245,6 +287,40 @@ def test_500_error_server_error(self):
             500, '', {}, None)):
             self.assertRaises(PMMailServerErrorException, batch.send)
 
+    def test_batch_mail_returns_results(self):
+        fake_payload = [
+            {
+                "To": "receiver@example.com",
+                "SubmittedAt": "2025-09-18T10:00:00Z",
+                "MessageID": "abc-123",
+                "ErrorCode": 0,
+                "Message": "OK",
+            }
+        ]
+
+        message = PMMail(
+            api_key="test-api-key",
+            sender="sender@example.com",
+            to="receiver@example.com",
+            subject="Hello",
+            text_body="Testing batch return",
+        )
+        # pass list of PMMail objects to PMBatchMail
+        batch = PMBatchMail(api_key="test-api-key", messages=[message])
+
+        with mock.patch("postmark.core.urlopen") as mock_urlopen:
+            mock_urlopen.return_value = make_fake_response(fake_payload)
+
+            # Test boolean return
+            results = batch.send()
+            self.assertTrue(results)
+
+            # Test JSON return explicitly
+            results_json = batch.send(return_json=True)
+            self.assertIsInstance(results_json, list)
+            self.assertEqual(results_json[0]["ErrorCode"], 0)
+
+
 
 class PMBounceManagerTests(unittest.TestCase):
     def test_activate(self):