server-tools/mail_environment/views/fetchmail_server_views.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
  <record model="ir.ui.view" id="inherit_fetchmail">
    <field name="model">fetchmail.server</field>
    <field name="inherit_id" ref="fetchmail.view_email_server_form"/>
    <field name="arch" type="xml">
      <field name="server" position="attributes">
        <attribute name="attrs" eval="False"/>
      </field>
      <field name="port" position="attributes">
        <attribute name="attrs" eval="False"/>
      </field>
      <field name="user" position="attributes">
        <attribute name="attrs" eval="False"/>
      </field>
      <field name="password" position="attributes">
        <attribute name="attrs" eval="False"/>
      </field>
    </field>
  </record>
</odoo>