Q:

Email throttling option in Salesforce Marketing Cloud

we  moved to Salesforce Marketing Cloud platform recently, our requirement set the maximum limit for emails per hour is to 100000 emails and no more than 1 million emails in a day. 
Is there any out of box functionality available for Scheduling within a single campaign, i.e send the total audience throughout the day (e.g. 1 million subscribers per day at max, send 100k every hour), In other words we need to restrict daily/hourly email send limits.

A:

This can be achieved by Send Throttling.  It is not necessary to contact customer support as this can now be done within the Setup Application!  Here is the clickpath to enabling this:
Setup > Platform Tools > Email Studio > Email Optional Features > "Send Throttling"
As for the secondary part of the question, you can cap the total sends by defining a specific "send window" such as 10:00 AM to 8:00 PM which, in this case would achieve sending to no more than a million a day.   100k per hour/no more than 1 million sent. 
Finally, the user in another comment in this thread notes that it isn't possible to use Salesforce Audiences, but this is untrue.   Utilizing Synchronized Data Sources will allow for you to use A/B Testing, Dynamic Content, and any other things that you might want to when testing.

