I was sent an email which I thought was legit . I opened an attachment (zip file) but nothing in it. I phoned the bank to double check, and of course the email was bogus. How can I tell whether my macbook air version X.9.4 has a virus or not.

I was sent an email which I thought was legit . I opened an attachment (zip file) but nothing in it. I phoned the bank to double check, and of course the email was bogus. How can I tell whether my macbook air version now has a virus?

No Mac viruses are propagated through email.
Be vigilant for suspicious activity as you normally should be, but do not download or install some "anti-virus" utility in an effort to fix a problem that does not exist. That's a well-worn path to certain misery.

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