I don't do it for every vendor but I have a separate email address that I use just for Amazon. The primary reason is because Amazon has a huge security hole by

I don't do it for every vendor but I have a separate email address that I use just for Amazon. The primary reason is because Amazon has a huge security hole by way of chat and call center reps. There used to be a way to hack into someone's Amazon account that went like this: 1. Call Amazon and say I'm 300 bps and my email is 300bps@gmail.com 2. Tell the rep you want to add a credit card on your account and give them the credit card 3. Do a forgot my password. One of the MFA questions was "What are the last 4 digits of any credit card on your account?" So to hedge against this particular exploit and any unknown ones that come up caused by Amazon's giant target and their accommodative customer service, I just use a unique email address on their site.