I would like to send an email (using template) to customer but I don't want to create said email in record chatter as well.
Right now I use the method send_mail() from mail.mail_template.
If you are planning to send email via Odoo core Email wizard, then it is not possible because the "composition_mode" field is required and default value is comment.
But if you can achieve it with a new custom button, type=object. On the button click, the method will trigger in the background, fetch an email template and send it.
How to prevent emails from being created in record chatter after sending email to customer?