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Even logging on only ERROR conditions can generate plenty of mail, so this trick is best employed in conjunction with additional changes not shown here, such as message filtering.

For reference:

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Edit %{idp.home}/conf/logback.xml and append this new appender code block after the last existing <appender> definition:

<smtpHost> : Hostname or IP address of your mail server (probably localhost in most cases)
<from> : The from address on any emails sent from Logback
<subject> : The subject of the emails sent from Logback. ${HOSTNAME} will reference the computer name on which Logback is running

<level> : What condition to take action on (DEBUG, INFO, WARN, ERROR)

Code Block

language	xml
title	Logback.xml SMTP Appender
collapse	true

<!-- Custom SMTP Appender for ERROR -->
<appender name="Email_Alerts" class="ch.qos.logback.classic.net.SMTPAppender">
      <smtpHost>SMTPHOSTNAME</smtpHost>
      <from>FROMEMAILADDRESS</from>
      <to>TOEMAILADDRESS</to>
      <subject>${HOSTNAME} IDP Error Detected</subject>
      <layout class="ch.qos.logback.classic.html.HTMLLayout"/>
      <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
          <level>ERROR</level>
      </filter>
</appender>
<!-- /Custom SMTP Appender for ERROR -->

Click here for additional SMTPAppender properties and information.

Add a reference to the new appender:
1. Find the existing code <root level="INFO">
  1. Hooking in here allows you to configure your appender to alert on any severity
  2. Alternatively, you can create your own root level block if you don't want to modify the existing block
2. Append a new reference after the existing references:
  Code Block
  <appender-ref ref="Email_Alerts"/>

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