Hello
Looking for an advice what is the best service to send 1k list of non-subscribers ,that not landed in junk folder .
If the email content is relevant to the "non-subscribers" ie. it's well targeted then you can use Mailchimp without problems. For a long time. But if it has low open rates, low click through rates and high unsubscribe rate then you'll be banned from there soon.
Well, it depends on how you got those 1,000 subscribers.