Basic NLog configuration file with a file target for Info+ and an email target for error+

NLog.config

<?xml version="1.0" encoding="utf-8" ?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

  <!-- 
  See http://nlog-project.org/wiki/Configuration_file 
  for information on customizing logging rules and outputs.
   -->

  <variable name="linePrefix" value="${date:format=yyyy-MM-dd HH\:mm\:ss} ${pad:padding=5:inner=${uppercase:${level}}} ${callsite:IncludeSourcePath=false} - "/>
  <variable name="exceptionFormat" value="${onexception:${newline}EXCEPTION OCCURRED\:${exception:format=type,message,method,stacktrace:maxInnerExceptionLevel=5:innerFormat=shortType,message,method}}"/>
  <variable name="appName" value="PromoPort"/>
  
  <targets>
    <!-- add your targets here -->

    <target xsi:type="File"
            name="default"
            fileName="${basedir}/logs/${appName}_${shortdate}.log"
            layout="${linePrefix}${message}${exceptionFormat}" />
  
    <target xsi:type="Mail"
            name="ErrEmail"
            smtpServer="192.168.2.75"
            from="noreply@example.com"
            to="noreply@example.com"
            subject="${appName}: Exception Error"
            body="${linePrefix}${message}${newline}${exceptionFormat}"/>

  </targets>

  <rules>
    <!-- add your logging rules here -->

    <logger name="*" minlevel="Info" writeTo="default" />
    <logger name="*" minlevel="Error" writeTo="ErrEmail" />
    
  </rules>
</nlog>