social/mail_optional_autofollow/wizard/mail_compose_message_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data noupdate="0">
        <record model="ir.ui.view" id="email_compose_message_wizard_inherit_form">
            <field name="name">mail.compose.message.form (mail_optional_autofollow)</field>
            <field name="model">mail.compose.message</field>
            <field name="inherit_id" ref="mail.email_compose_message_wizard_form"/>
            <field name="arch" type="xml">
                <xpath expr="//div[field[@name='partner_ids']]" position="after">
                    <field name="autofollow_recipients" />
                </xpath>
            </field>
        </record>
    </data>
</openerp>