Manual states that when syncing users from a joomla user group to mailchimp, " As the red text warns, however, these users will be sent a confirmation email before they're added to a MailChimp list." This is not acceptable. No one would want this to happen.

We need all users in a group to be synced without sending them the confirmation email. Is this possible?

https://connect.mailchimp.com/how-to/36