Add note about Gmail connector usage

Author: ecfan

articles/event-grid/publish-iot-hub-events-to-logic-apps.md

@@ -17,9 +17,19 @@ This article walks through a sample configuration that uses IoT Hub and Event Gr
 
 ## Prerequisites
 
-* An email account from any email provider that is supported by Azure Logic Apps, like Office 365 Outlook, Outlook.com, or Gmail. This email account is used to send the event notifications. For a complete list of supported Logic App connectors, see the [Connectors overview](https://docs.microsoft.com/connectors/)
-* An active Azure account. If you don't have one, you can [create a free account](https://azure.microsoft.com/pricing/free-trial/).
-* An IoT Hub in Azure. If you haven't created one yet, see [Get started with IoT Hub](../iot-hub/iot-hub-csharp-csharp-getstarted.md) for a walkthrough. 
+* An active Azure subscription. If you don't have a subscription, you can [create a free Azure account](https://azure.microsoft.com/pricing/free-trial/).
+
+* An email account from any email provider that is supported by Azure Logic Apps, such as Office 365 Outlook, Outlook.com, or Gmail. This email account is used to send the event notifications. For a complete list of supported Logic App connectors, see the [Connectors overview](https://docs.microsoft.com/connectors/).
+
+  > [!IMPORTANT]
+  > Before you use Gmail, check whether you have a G-Suite business account (email address with a custom domain) 
+  > or a Gmail consumer account (email address with @gmail.com or @googlemail.com). Only G-Suite business accounts 
+  > can use the Gmail connector with other connectors without restriction in logic apps. If you have a Gmail consumer account, 
+  > you can use the Gmail connector with only specific Google-approved services, or you can 
+  > [create a Google client app to use for authentication](https://docs.microsoft.com/connectors/gmail/#authentication-and-bring-your-own-application). 
+  > For more information, see [Data security and privacy policies for Google connectors in Azure Logic Apps](../connectors/connectors-google-data-security-privacy-policy.md).
+
+* An IoT Hub in Azure. If you haven't created one yet, see [Get started with IoT Hub](../iot-hub/iot-hub-csharp-csharp-getstarted.md) for a walkthrough.
 
 ## Create a logic app