When you start sending emails, inbox providers closely monitor your activity. Sending a large volume all at once can hurt your deliverability and cause emails to land in spam. Send limits are a standard practice across email platforms.
To protect your sender reputation, we gradually send campaigns (e.g., ~100 emails/day, up to 300 per campaign). This helps build trust with inbox providers so more of your emails reach readers over time. As your performance stays strong, these limits increase.