social/mail_edit/security/mail_edit_security.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data noupdate="1">

        <record model="res.groups" id="group_mail_edit_editor" >
            <field name="name">Edit own mail messages</field>
            <field name="comment">Members of this group are able to edit mail messages.</field>
            <field name="category_id" ref="base.module_category_hidden"/>
            <field name="users" eval="[(4, ref('base.user_root'))]"/>
        </record>

        <record model="res.groups" id="group_mail_edit_mover">
            <field name="name">Move own mail messages</field>
            <field name="comment">Members of this group are able to move mails.</field>
            <field name="category_id" ref="base.module_category_hidden"/>
            <field name="users" eval="[(4, ref('base.user_root'))]"/>
        </record>

        <record model="res.groups" id="group_mail_edit_superuser">
            <field name="name">Edit or Move anyone's mail messages</field>
            <field name="comment">Members of this group are able to move or edit mails</field>
            <field name="category_id" ref="base.module_category_hidden"/>
            <field name="users" eval="[(4, ref('base.user_root'))]"/>
        </record>

    </data>
</openerp>