1. Servers: Upgrading to faster, more powerful servers can handle larger volumes of email traffic and complex computations. 2. Storage Systems: High-speed, reliable storage solutions like SSDs can improve data retrieval times and overall system performance. 3. Network Equipment: Upgrading routers, switches, and firewalls can enhance network security and speed, reducing the risk of email delivery issues. 4. Workstations: Modern computers with faster processors and more RAM can help your marketing team work more efficiently, especially when dealing with large datasets.