How to subscribe to a different list per language

You can configure MailChimp Auto-Subscribe to send new users to multiple lists based on the language of your Joomla! website.

To do that navigate to the plugin's "Settings" Tab as shown in the screenshot below and add in the "List ID" field a JSON String in the following format.

{"langcode":"listid","langcode":"listid"}

For example, {"en":"388fe39a06","el":"3e135f1b59"} in case you have the English and the Greek language activated in Joomla.

Also, make sure that for this use case you must select the "Per Language" option for the "Multiple Lists" field as shown in the screenshot above.