with SMTPAppender I receive only ERROR and not INFO type of log items

I've configured an SMTPAppender into my Java app.

<appender name="AdministratorEmail" class="org.apache.log4j.net.SMTPAppender">
  <param name="Threshold" value="info" />
  <param name="BufferSize" value="512" />
  <param name="SMTPHost" value="smtp.sss.intranet" />
  <param name="From" value="adminEbookMaker@sss.intranet" />
  <param name="To" value="user@sss.it" />
  <param name="Subject" value="errors" />       
  <layout class="org.apache.log4j.PatternLayout">
    <param name="ConversionPattern" value="[%d{ISO8601}]%n%n%-5p%n%n%c%n%n%m%n%n" />
  </layout>
  <filter class="org.apache.log4j.varia.LevelRangeFilter">
    <param name="LevelMin" value="info" />
    <param name="LevelMax" value="fatal" />
  </filter>
</appender>

I receive only the ERROR log type and not the INFO type! I changed the LevelMin but nothing, I inserted the Thresold, but nothing!

Does someone have any kind of suggestion?