Certainly, setting up language-specific mailing lists and automations in Odoo can be a bit tricky, but it's definitely achievable. The steps you need to follow involve configuring the marketing automation workflows and the contact segmentation correctly. Here's a step-by-step guide to help you achieve the desired behavior:

Create Mailing Lists:

Go to "Marketing" > "Email Marketing" > "Mailing Lists".
Create two mailing lists: "newsletter-spanish" and "newsletter-english".
Create Automation Workflows:

Go to "Marketing" > "Automation" > "Automations".
Create two new automation flows: one for the Spanish version and another for the English version.
Configure Automation Workflows:
For each automation workflow:

Add a Trigger: "Contact is Created".
Add a Condition:
Choose "Contact" for the model.
Choose "Language" for the field.
Choose the respective language (Spanish or English).
Add an Action:
Choose "Add to Mailing List" action.
Select the corresponding mailing list (newsletter-spanish or newsletter-english).
Newsletter Block Configuration:

Make sure that the subscription form for the newsletter on your website collects the language preference of the user along with their email.
You might need some custom development to ensure that the user's language preference is correctly captured and stored in Odoo's contact records.
Test the Setup:

Create a test subscriber for each language and see if they are added to the correct mailing lists automatically.
Enable Automation Campaigns:

If you want to send automatic emails to these segmented lists, you can set up email campaigns in the "Email Marketing" section and choose the segmented mailing lists as recipients.
Check for Updates:

Odoo updates and changes can affect functionalities. Make sure to consult the Odoo documentation or community if you face any issues.
Consider Custom Development:

If the built-in features don't offer the exact behavior you need, you might need to consider custom development or consulting with Odoo experts who can help you achieve your specific requirements.
Remember, Odoo's interface and features can vary slightly between versions, so make sure to consult the official Odoo documentation or community forums if you encounter any difficulties specific to your version.

Regards

Hi Muhammad,
By Go to Marketing > Automation > Automation-
Do you mean to go to Marketing Automation>Campaings>New?
And if so, what do you select as your target?

Thanks Jason