Hello,

I don´t use codes... can this be done with Studio?

Best,

code to get all followers' emails
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followers = self.env['mail.followers'].search([('res_model', '=', 'sale.order'), ('res_id', '=', sale_order_id)])

emails = [follower.partner_id.email for follower in followers]

Add these emails to the Cc field
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email_values = {

    'subject': 'Sales Order Notification',

    'email_to': main_recipient_email,

    'email_cc': ','.join(emails),

    # other email parameters

}

mail = self.env['mail.mail'].create(email_values)

mail.send()