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You are right Diego, we did have the GetResponse integration, which is not available at this time.
The reason is that the integration is currently being updated, so it can no longer be accessed. It will however become available in some time - although we can not give you an exact timeframe for this.
If you wish, we could raise this to our developers to ask them to update you once the integration is available again?
In the meantime my suggestion would be to either use Zapier to connect your form to GetResponse: https://zapier.com/zapbook/jotform/getresponse/ - you can see here how to connect your form to Zapier: JotForm is now on Zapier: Send Your Form Data to 100+ Web Services
As an alternative, you could also use some other service such as MailChimp or Aweber instead, if you want to set one up right away.