Email Engagement is the primary driver for success. When a hotel sends to users who haven’t engaged (Opens/Clicks) for some time, then the risks of a hotel experiencing a placement rate issue (Spam/Inbox) considerably goes up.
Revinate recommends only sending to users who have opened or clicked within the last 12 Months (One Year)
Exceeding that would increase the chances of a hotel encountering negative deliverability metrics. Negative metrics include Complaints, Unknown Users, Spam Traps, and Blacklists.