log4j-core/src/test/resources/SmtpAppenderAsyncTest.xml

<?xml version="1.0" encoding="UTF-8"?>
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<Configuration name="SmtpAppenderAsyncTest" status="WARN">
    <Appenders>
        <SMTP name="mail-sync" to="to@example.com" from="from@example.com" smtpHost="localhost"
              smtpPort="${sys:smtp.port}" ignoreExceptions="false" subject="[%X{MDC1}]">
            <PatternLayout pattern="Body:[%X{MDC1}]" />
        </SMTP>
        <Async name="mail-async">
            <AppenderRef ref="mail-sync"/>
        </Async>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="%d [%t] %-5level: %msg%n%throwable" />
        </Console>
    </Appenders>
    <Loggers>
        <Root level="FATAL">
          <AppenderRef ref="Console"/>
        </Root>
        <Logger name="sync" level="INFO">
            <AppenderRef ref="mail-sync"/>
        </Logger>
        <Logger name="async" level="INFO">
            <AppenderRef ref="mail-async"/>
        </Logger>
    </Loggers>
</Configuration>