Split mailing list into chunks of 500 emails to respect Postmark's API limits. Thanks Asaf for pointing this out

send_mail.py

@@ -5,6 +5,7 @@
 # ============================    Contributors    =========================
 # Bug & warning fixes
 #  Jacob Bell (@MysteriousJ)
+#  Asaf Gartner
 #
 # Emotional Support
 #  Cucui Ganon Rosario
@@ -68,30 +69,39 @@ def sendPostmarkMessage(subject, body, to):
     }
 
     messages = []
-    for email in to:
-        message = {
-            "From": POSTMARK_SENDER_EMAIL,
-            "To": email,
-            "TemplateId": POSTMARK_TEMPLATE_ID,
-            "TemplateModel": {
-                "name": SENDER_NAME,
-                "email": POSTMARK_SENDER_EMAIL,
-                "body": body,
-                "subject": subject
-            },
-            "MessageStream": POSTMARK_MESSAGE_STREAM
+    
+    # Postmark supports 500 messages per API call.
+    # Split the 'to' list into chunks of 500 or fewer email addresses
+    for i in range(0, len(to), 500):
+        to_chunk = to[i:i+500]
+        
+        for email in to_chunk:
+            message = {
+                "From": POSTMARK_SENDER_EMAIL,
+                "To": email,
+                "TemplateId": POSTMARK_TEMPLATE_ID,
+                "TemplateModel": {
+                    "name": SENDER_NAME,
+                    "email": POSTMARK_SENDER_EMAIL,
+                    "body": body,
+                    "subject": subject
+                },
+                "MessageStream": POSTMARK_MESSAGE_STREAM
+            }
+            messages.append(message)
+
+        payload = {
+            "Messages": messages
         }
-        messages.append(message)
 
-    payload = {
-        "Messages": messages
-    }
+        # Debug:
+        # print(json.dumps(payload, indent=4))
 
-    # Debug:
-    # print(json.dumps(payload, indent=4))
-
-    result = requests.post(POSTMARK_API_URL, headers=headers, json=payload)
-    print(result.text)
+        result = requests.post(POSTMARK_API_URL, headers=headers, json=payload)
+        print(result.text)
+        
+        # Clear the messages list for the next chunk
+        messages.clear()
 
 if __name__ == '__main__':
     # Create a ConfigParser object and read the INI file