Hi,

You can customize the sender email (email_from) for chatter messages by overriding the message_post method. For example:

class MailThread(models.AbstractModel):

    _inherit = 'mail.thread'

    @api.model

    def message_post(self, **kwargs):

        if not kwargs.get('email_from'):

            kwargs['email_from'] = 'custom_email@example.com'  # Set your custom email address

        return super().message_post(**kwargs)

This will set a custom sender email if one is not provided when posting a message.

Hope it helps

Any update?