In a job hunt email a person said that is not looking for someone right now, Let's be in touch summer 2017.
What does he mean and how can I say to him that I would like to speak more closely to the date?
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I'm going to assume you tried to look up touch, but the sentence still didn't make sense.
The idiom in this case is be in touch.
be in touch
So let's be in touch summer 2017 essentially means let's talk in summer 2017.
Well, if it's job related, and you want to say that you will speak around summer 2017, then you could say
Option 2. implies that you will contact this person in the future.