When you purchase a domain, setting up the DNS NS (Name Server) record is crucial, as it directs your domain to the appropriate DNS server. This server then translates your domain into an IP address, enabling web and email access. The DNS server handles web requests by providing the web server's IP, and email requests by supplying the email server's IP, ensuring proper message routing. Additionally, the DNS configuration impacts email storage and management. By properly configuring your domain's DNS settings, you can optimize email delivery and leverage ample storage from services like Google Workspace or Office 365, complementing your web hosting's email capabilities.