title: with SMTPAppender I receive only ERROR and not INFO type of log items
body: <p>I've configured an SMTPAppender into my Java app.</p>
  
  <pre><code>&lt;appender name="AdministratorEmail" class="org.apache.log4j.net.SMTPAppender"&gt;
    &lt;param name="Threshold" value="info" /&gt;
    &lt;param name="BufferSize" value="512" /&gt;
    &lt;param name="SMTPHost" value="smtp.sss.intranet" /&gt;
    &lt;param name="From" value="adminEbookMaker@sss.intranet" /&gt;
    &lt;param name="To" value="user@sss.it" /&gt;
    &lt;param name="Subject" value="errors" /&gt;       
    &lt;layout class="org.apache.log4j.PatternLayout"&gt;
      &lt;param name="ConversionPattern" value="[%d{ISO8601}]%n%n%-5p%n%n%c%n%n%m%n%n" /&gt;
    &lt;/layout&gt;
    &lt;filter class="org.apache.log4j.varia.LevelRangeFilter"&gt;
      &lt;param name="LevelMin" value="info" /&gt;
      &lt;param name="LevelMax" value="fatal" /&gt;
    &lt;/filter&gt;
  &lt;/appender&gt;
  </code></pre>
  
  <p>I receive only the ERROR log type and not the INFO type! I changed the <strong>LevelMin</strong> but nothing, I inserted the <strong>Thresold</strong>, but nothing! </p>
  
  <p>Does someone have any kind of suggestion?</p>