mail-addons/mailgun/data/cron.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
  <data noupdate="1">
    <record id="mailgun_domain_verification" model="ir.cron">
      <field name="name">Mailgun - domain verification</field>
      <field name='interval_number'>10</field>
      <field name='interval_type'>minutes</field>
      <field name="numbercall">288</field>
      <field name="active">True</field>
      <field name="model">ir.config_parameter</field>
      <field name="function">mailgun_verify</field>
    </record>
  </data>
</openerp>