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I did join an airdrop once, since that day I keep receiving spam emails. There is not such a thing as free lunch.

i use a throwaway email address and a disposable ether address on myetherwallet.
here's an extremely easy one i just did, where you just enter your ether wallet address. no email or anything else.
http://referral.redpocket.network/JMSaLVLr

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