There are several reasons why marketers might opt for scheduled throttling:
Server Load Management: Sending a large volume of emails at once can overwhelm your email server, leading to delays or even crashes. Throttling helps manage the load more effectively. ISP Relationship: Internet Service Providers (ISPs) monitor email traffic. A sudden spike can trigger spam filters. Throttling helps maintain a good reputation with ISPs. User Experience: Throttled emails can help ensure that your recipients don't receive your emails at inconvenient times, improving open and click-through rates.