You can send up to 500 emails per day from a single email account. You may integrate multiple email accounts to send more.
SmartReach.io provides you various checks to manage your sending limits so you don't blast a large number of emails or spam a specific prospect by mistake.
To update the maximum number of emails that should be sent per day from an email account (even when you are sending multiple campaigns from this email account), go to: Settings -> Team Settings -> Email Accounts -> click on email account -> Edit Email Settings -> Maximum number of emails that can be sent per day
To update the maximum number of emails that should be sent per day from a campaign, go to: Campaigns -> click on campaign Name -> Campaign Settings -> Additional settings -> Max Emails to be sent per day from this campaign
To prevent you from sending a lot of emails to one prospect by mistake, there are daily / weekly sending limits per prospect (by default, you can send one email to a prospect per day, and 3 emails per week from campaigns). You can update these here: Settings -> Team Settings -> Team prospect settings -> Sending limits per prospect