InstantData allows you to directly import your list from these email service providers (ESPs): Mailchimp, Constant Contact, Emarsys, Bronto, HubSpot, Iterable, Aweber and GetResponse. Click on any of the prior links to see a help article for that provider.
If you import from one of these ESPs, you'll get free Email Validation and Email Intelligence reports on the status and composition of your list. Results by record are available by purchase.
Purchased results can be exported back to these ESPs: Mailchimp, Emarsys, Bronto, and Iterable.
For other service providers, you can download your list from your account onto your computer and upload it into InstantData. Similarly, you can download InstantData results to your computer and upload them to your provider to update your list.