The practical work usually starts in the property management system. Guest profiles are often duplicated across stays, spelled differently by different clerks, or merged with the booker's details when an assistant reserved the room. Before sending a single campaign, the specialist maps which fields are reliable, how the system exports them and how often the email platform should sync.
Relay addresses from travel agencies
Reservations that arrive through large booking sites frequently carry a proxy address that forwards only transactional mail for a limited time. Adding those to a marketing list is both pointless and risky. The better route is to invite the guest to share a personal address during the stay: a Wi-Fi login page, a digital check-in form, a restaurant reservation or a friendly question at the desk, each with a clear note about what they will receive.
Transactional mail versus marketing mail
Booking confirmations and pre-arrival details are service messages, while a spring package offer is marketing and falls under CAN-SPAM rules, with a working unsubscribe and a physical mailing address. Guests from other countries may bring their own privacy expectations. Keeping the two streams separate, often on separate sending subdomains, protects confirmations from the reputation hit a promotional send can take.