When creating your delivery you can cap the number of successful deliveries with this feature.
You have the flexibility to choose between Hourly, Daily, Weekly, Monthly and Total caps for each delivery.
Monthly, Weekly, Daily and Hourly caps refresh each respective timeframe, however the total cap will remain as is until you edit it.
Keep in mind that you won't receive any errors or warnings when your delivery cap has been hit, leads will simply no longer been sent until the next timeframe. If you would like to get an email alert you can set this up under Campaigns > Alerts. More about alerts HERE
It is also worth noting that 0 in the cap field stands for no limit. This means there is no cap and unlimited leads can be delivered.