Quotas exist primarily for three reasons: 1. Preventing Spam: High volumes of unsolicited emails can be flagged as spam, damaging your sender reputation and reducing deliverability. 2. Server Load Management: Sending too many emails at once can overload email servers, causing delays or failures in email delivery. 3. Compliance: Many countries have laws and regulations like the [CAN-SPAM Act](href="") and [GDPR](href="") that dictate how many emails can be sent and how often.