Update service-limits.md

Author: bashan-git

articles/communication-services/concepts/service-limits.md

@@ -69,6 +69,28 @@ If you require sending an amount of messages that exceeds the rate-limits, pleas
 
 For more information on the SMS SDK and service, see the [SMS SDK overview](./sms/sdk-features.md) page or the [SMS FAQ](./sms/sms-faq.md) page.
 
+## Email
+Sending high volume of messages has a set of limitation on the number of email messages that you can send. if you hit these limits your messages will not be queued to be sent and you have to plan and submit the requests once the number of requests with in the allowed threshold.
+
+### Rate Limits 
+
+|Operation|Scope|Timeframe (minutes)| Limit (number of email) |
+|---------|-----|-------------|-------------------|
+|Send Email|Per Subscription|1|10|
+|Send Email|Per Subscription|60|25|
+|Get Email Status|Per Subscription|1|20|
+|Get Email Status|Per Subscription|60|100|
+
+### Size Limits
+
+| **Name**         | Limit  |
+|--|--|
+|Number of recipients in Email|50 |
+|Attachment size - per messages|10 MB |
+
+### Action to take
+This sandbox setup is to help developers to start building the application and gradually you can request to increase the sending volume as soon as the application is ready to go live. If you require sending an amount of messages that exceeds the rate-limits, please submit a support request to increase to your desired sending limit.
+
 ## Chat
 
 ### Size Limits