You can permanently unsubscribe from Hotels.com's spam emails in several ways:
• Find the "unsubscribe" link at the bottom of the email and follow the instructions. Unsubscribes may take a few days to take effect.
• Log in to Hotels.com and go to account settings. You can unsubscribe from all marketing emails or customize the ones you receive in the email preferences section.
• Marking Hotels.com emails as spam is another option, but not for long-term management. This won't stop them from being sent immediately, but it can train your email provider to filter them automatically.
• To avoid promotional spam in your main inbox, use a travel booking email address.
• Finally, third-party email management tools can simplify bulk unsubscribing and subscription management.
Feel free to contribute further information or insights in the comments or file your complaint.