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I'm not getting this email.
My suggestion, asking this on their telegram group. Because most people who are playing in "CHIPS" are chatting in the telegram not forum, we don't even see anymore people are discussing or chat in this thread except me or few people ~XD.
Definitely check that link with someone from Chips... telegram or just ask support about it! It looks fine, at least this image looks fine, what about the sender? Is that from chips.gg or there are some misspellings?
I got the same message a few times "This site cant provide a secure connection email.mail.chips.gg uses an unsupported protocol.", I was sure in the sites and I just continue... you can try the same, if you need to log in don't do it, it's a scam! If they ask for some deposit before you claim your bonus, it's a scam!

But we don't need to think about the worst from the start, check with them... maybe it's legit, and why not? A little cash bonus for some old players can wake them up!