server-tools/mail_environment/mail_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <record model="ir.ui.view" id="inherit_fetchmail">
            <!-- must be unique in this module. -->
            <field name="name">inherit_fetchmail_for_env_support</field>
            <field name="model">fetchmail.server</field>
            <!--parent python entity -->
            <field name="inherit_id" ref="fetchmail.view_email_server_form"/>
            <!-- modulename.view -->
            <field name="arch" type="xml">
                <field name="server"  attrs="{'required' : [('type', '!=', 'local')]}" position="replace">
                    <field name="server" />
                </field>
                <field name="port"  attrs="{'required' : [('type', '!=', 'local')]}" position="replace">
                    <field name="port" />
                </field>
                <field name="user"  attrs="{'required' : [('type', '!=', 'local')]}" position="replace">
                    <field name="user" />
                </field>
                <field name="password"  attrs="{'required' : [('type', '!=', 'local')]}" position="replace">
                    <field name="password" />
                </field>
            </field>
        </record>
    </data>
</openerp>