email_template_design/views/res_partner_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
  <data>
    <record id="act_email_count" model="ir.actions.act_window">
           <field name="name">Emails</field>
           <field name="res_model">mail.message</field>
           <field name="view_type">form</field>
           <field name="view_mode">tree,form</field>
           <field name="domain">[('type','!=','notification'), '|','|',('partner_ids','=',active_id), ('notified_partner_ids', '=', active_id), ('author_id','=',active_id)]</field>
           <field name="context">{}</field>
    </record>

    <record id="email_filter" model="ir.ui.view">
     <field name="name">Email Filter</field>
     <field name="model">mail.message</field>
     <field name="arch" type="xml">
       <search string="Search Email">
         <filter string="Entrante" name="incoming_email" domain="[('type', '=', 'email')]"/>
         <filter string="Saliente" name="outgoing_email" domain="[('type', '=', 'comment')]"/>
         <group expand="0" string="Group By">
           <filter name="group_by_type" string="Tipo de Email" context="{'group_by':'type'}"/>
         </group>
       </search>
     </field>
   </record>


    <record id="mail_message_tree_view" model="ir.ui.view">
      <field name="name">mail.message.tree.view</field>
      <field name="model">mail.message</field>
      <field name="inherit_id" ref="mail.view_message_tree"/>
      <field name="arch" type="xml">
        <field name="model" position="attributes">
          <attribute name="invisible">True</attribute>
        </field>
        <field name="res_id" position="attributes">
          <attribute name="invisible">True</attribute>
        </field>
        <field name="author_id" position="after">
          <field name="type" string="Tipo"/>
        </field>
      </field>
    </record>

    <record id="add_button_email_form" model="ir.ui.view">
      <field name="name">add.button.email.form</field>
      <field name="model">res.partner</field>
      <field name="inherit_id" ref="base.view_partner_form"/>
      <field name="arch" type="xml">
        <xpath expr="//div[@name='buttons']" position="inside">
          <button class="oe_inline oe_stat_button" type="action"
                  name="%(act_email_count)d"
                  icon="fa-envelope">
            <field string="Emails" name="email_count" widget="statinfo"/>
          </button>

        </xpath>
      </field>
    </record>
  </data>
</openerp>