Mailchimp

Paste a Mailchimp API key and each audience becomes a Gochi mailing list, its members CRM contacts (matched by email). Unsubscribes become email opt-outs and bounced addresses are suppressed. Every hour Gochi picks up Mailchimp's changes, unsubscribes anyone who opted out in Gochi, and adds people on the linked lists who have agreed to marketing email. Campaign opens and clicks are not brought across.