Email is good.

I tried to unsubscribe from the World of Hyatt emails I was getting. They have an obnoxious email setting screen with lots of negatives to figure out. Like you decline to agree to opt-out to not receive email communications.

But also they say:

3. Write to (include World of Hyatt membership number):
    World of Hyatt Customer Service
    9‌805 Q Street
    Omaha, NE 68127

Please allow at least two (2) full business days from receipt of your message for us to remove your name from our subscriber list.

Me:

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And of course: related.