It's a legit email from blockchain wallet... I received one back in November last year.
Please note that there are 2 different addresses that blockchain wallet uses so far:
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noreply@blockchain.com - I usually get new updates through this one, about the stellar airdrop and the last update was about supporting Bitcoin SV on Jan 23
rd 2019
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no-reply@blockchain.info - sends emails about Authorizing Log-In attempts and email verification links