1. Search for a user here: https://gitcoin.co/_administrationmarketing/emailsubscriber/

2. Uncheck "newsletter"

3. You can also add suppression preferences under "preferences" - this essentially mimics what a user turns on or off in their profile settings email tab.

{"suppression_preferences": {"tip": true, "chat": true, "bounty": true, "faucet": true, "comment": true, "general": true, "mention": true, "roundup": true, "quarterly": true, "wall_post": true, "bounty_match": true, "welcome_mail": true, "grant_updates": true, "bounty_feedback": true, "grant_txn_failed": true, "bounty_expiration": true, "grant_recontribute": true, "featured_funded_bounty": true, "new_bounty_notifications": true, "important_product_updates": true}}