Hi,

Hope you are making changes in the PDF attachment of order/invoice with the mail.
You have to change the template to bring customer address from right side to left side.

<  odoo>
    <  data>
        <  template id="address_layout" inherit_id="web.address_layout">
            <  xpath expr="//div[@name='address']" position="replace">
                <  div name="address" class="ml-3 mb-5">
                    <  t t-raw="address"/>
                <  /div>
            <  /xpath>
        <  /template>
    <  /data>
<  /odoo>

Regards