Growbots doesn’t limit the number of messages sent daily from your account; however, you need to remember that your email provider might have some limitations of their own.
We strongly recommend that you send only 200 messages per day, per email. When you hit that limit, you might get your account blocked for 24 hours. In order to avoid such situation we advise you to connect multiple email accounts and send batches of up to 200 emails per address.
Each email provider has a different setup but in most cases it’s about 200–300 messages daily. Please check with your provider how many messages you can send safely each day.