If you send a DM to someone who doesn't follow you, will they still get a push notification?

Let's say you've been texting someone and they unfollow you.

What happens next time you text them? Will your message go to their inbox, or will it go to the message requests (if so, will they still get a push notification)?

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**On instagram**
If you send a DM to someone who doesn't follow you, will they still get a push notification?
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