Quite often, when an user submit a CF7 form with mailchimp checkbox included and checked, the “MailChimp for wordpress” plugin throws the next error:
ERROR: Contact Form 7 > MailChimp API Error: cURL error 6: name lookup timed out.

It shouldn’t be a problem, but it is, because the form shows a green message indicating it was sent correctly. But the suscription wasn’t done and, even more, the form data from cf7 wasn’t sent… so it should show a red fail message.

How can you reproduce this issue?
1. Make a form with contact form 7
2. Add a mailchimp checkbox
3. Send it, it will fail several times (Meaby when the admin didn’t logged-in in a while?)
4. You will see the error in the log, but you have not been suscribed and you won’t receive the form data.

Contact Form 7 version: 4.9.1 (last at this moment)
MailChimp for WordPress version: 4.1.11 (last at this moment)