There are two types of limits you can set for sending out cold emails - Account limits and Campaign Limits
For example, if you wanted one of your campaigns to send out 500 emails per day, while at the same time you wanted each account to only send 50 of those, you can do so by setting a campaign limit of 500 and individually setting a limit of 50 to each of your accounts, assuming there are 10 of them.
You can set your account limit by going into your campaign settings -
Go to your campaign, then go to Options
Scroll down to the very bottom to find the campaign limit.
You can only reduce the gap between your emails to make sure the intended volume of your email goes out per day - OPTIONAL
You can set your account limit by going into your account settings -
Click on settings icon
Go to Settings page and check "Daily Send limit"