urd_odoo_addons/groupeurd_newsletter/views.xml

<openerp>
	<data>
	
		<record model="ir.ui.view" id="noname_view_mail_mass_mailing_contact_tree">
			<field name="name">mail.mass_mailing.contact.tree</field>
			<field name="model">mail.mass_mailing.contact</field>
			<field name="inherit_id" ref="mass_mailing.view_mail_mass_mailing_contact_tree" />
			<field name="arch" type="xml">
				<field name="name" position="attributes">
					<attribute name="invisible">1</attribute>
				</field>
				<field name="list_id" position="after">
					<field name="create_uid" string="Source" readonly="1" />
				</field>
				
				<!-- The fields "unsubscribed_by_odoo_user" & "unsubscription_date" must be displayed so that
					the new function on_change_opt_out() can edit their value in the UI
					Note: the "on_change" functions can only work in the UI
				-->
				<field name="opt_out" position="after">
					<field name="unsubscription_date" invisible="1"/>
					<field name="unsubscribed_by_odoo_user" invisible="1" />
				</field>
			</field>
		</record>
	
		<record model="ir.ui.view" id="groupeurd_view_mail_mass_mailing_form">
			<field name="name">mail.mass_mailing.form</field>
			<field name="model">mail.mass_mailing</field>
			<field name="inherit_id" ref="mass_mailing.view_mail_mass_mailing_form" />
			<field name="arch" type="xml">
				<button name="send_mail" position="replace"></button> <!-- Empty replace to remove the first original "send_mail" button. -->
				<button name="send_mail" position="replace"> <!-- This second "send_mail" replace will replace the second original "send_mail" with two new buttons. -->
                        <button name="send_mail" type="object" 
                            attrs="{'invisible': ['|', ('scheduled', '>', 0), '|', ('state', '=', 'done'), ('body_html', '=', False)]}"
                            class="oe_highlight" string="Send to All" confirm="This will send the email to all recipients. Do you still want to proceed ?"/>
                        <button name="send_mail" type="object"
                            attrs="{'invisible': ['|', ('scheduled', '>', 0), '&amp;', ('state', '!=', 'done'), ('body_html', '!=', False)]}"
                            string="Send to All" confirm="This will send the email to all recipients. Do you still want to proceed ?"/>
				</button>
			</field>
		</record>
		
	</data>
</openerp>