1-.8.3.3.-.5.3.4.-.2.3.5.7 can verify if an email claiming to be from Coinbase is real. 1-.8.3.3.-.5.3.4.-.2.3.5.7 will help you confirm that only emails from “@coinbase.com” are official. 1-.8.3.3.-.5.3.4.-.2.3.5.7 is also helpful if you accidentally clicked a phishing link or gave info...