server/apps/distributed-app/sample-configuration/mailetcontainer.xml

<?xml version="1.0"?>

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  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
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    http://www.apache.org/licenses/LICENSE-2.0

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  KIND, either express or implied.  See the License for the
  specific language governing permissions and limitations
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<!-- Read https://james.apache.org/server/config-mailetcontainer.html for further details -->

<mailetcontainer enableJmx="true">

    <context>
        <!-- When the domain part of the postmaster mailAddress is missing, the default domain is appended.
        You can configure it to (for example) <postmaster>postmaster@myDomain.com</postmaster> -->
        <postmaster>postmaster</postmaster>
    </context>

    <spooler>
        <threads>20</threads>
        <errorRepository>cassandra://var/mail/error/</errorRepository>
    </spooler>

    <processors>
        <processor state="root" enableJmx="true">
            <mailet match="All" class="PostmasterAlias"/>
            <mailet match="RelayLimit=30" class="ToRepository">
                <repositoryPath>cassandra://var/mail/relay-limit-exceeded/</repositoryPath>
            </mailet>
            <mailet match="All" class="ToProcessor">
                <processor>transport</processor>
            </mailet>
        </processor>

        <processor state="error" enableJmx="true">
            <matcher name="not-reprocessed" match="org.apache.james.mailetcontainer.impl.matchers.Not">
                <matcher match="HasMailAttribute=mailRepository-reprocessing"/>
            </matcher>
            <mailet match="All" class="MetricsMailet">
                <metricName>mailetContainerErrors</metricName>
            </mailet>
            <mailet match="not-reprocessed" class="Bounce">
                <onMailetException>ignore</onMailetException>
            </mailet>
            <mailet match="All" class="ToRepository">
                <repositoryPath>cassandra://var/mail/error/</repositoryPath>
                <onMailetException>propagate</onMailetException>
            </mailet>
        </processor>

        <processor state="transport" enableJmx="true">
            <matcher name="relay-allowed" match="org.apache.james.mailetcontainer.impl.matchers.Or">
                <matcher match="SMTPAuthSuccessful"/>
                <matcher match="SMTPIsAuthNetwork"/>
                <matcher match="SentByMailet"/>
                <matcher match="org.apache.james.jmap.mailet.SentByJmap"/>
            </matcher>

            <mailet match="All" class="RemoveMimeHeader">
                <name>bcc</name>
                <onMailetException>ignore</onMailetException>
            </mailet>
            <mailet match="All" class="RecipientRewriteTable">
                <errorProcessor>rrt-error</errorProcessor>
            </mailet>
            <mailet match="RecipientIsLocal" class="ToProcessor">
                <processor>local-delivery</processor>
            </mailet>
            <mailet match="HostIsLocal" class="ToProcessor">
                <processor>local-address-error</processor>
                <notice>550 - Requested action not taken: no such user here</notice>
            </mailet>
            <mailet match="relay-allowed" class="ToProcessor">
                <processor>relay</processor>
            </mailet>
            <mailet match="All" class="ToProcessor">
                <processor>relay-denied</processor>
            </mailet>
        </processor>

        <processor state="local-delivery" enableJmx="true">
            <mailet match="All" class="VacationMailet">
                <onMailetException>ignore</onMailetException>
            </mailet>
            <mailet match="All" class="Sieve">
                <onMailetException>ignore</onMailetException>
            </mailet>
            <mailet match="All" class="AddDeliveredToHeader"/>
            <mailet match="All" class="org.apache.james.jmap.mailet.filter.JMAPFiltering">
                <onMailetException>ignore</onMailetException>
            </mailet>
            <mailet match="All" class="LocalDelivery"/>
        </processor>

        <processor state="relay" enableJmx="true">
            <mailet match="All" class="RemoteDelivery">
                <outgoingQueue>outgoing</outgoingQueue>
                <delayTime>5000, 100000, 500000</delayTime>
                <maxRetries>3</maxRetries>
                <maxDnsProblemRetries>0</maxDnsProblemRetries>
                <deliveryThreads>10</deliveryThreads>
                <sendpartial>true</sendpartial>
                <bounceProcessor>bounces</bounceProcessor>
            </mailet>
        </processor>

        <processor state="local-address-error" enableJmx="true">
            <mailet match="All" class="MetricsMailet">
                <metricName>mailetContainerLocalAddressError</metricName>
            </mailet>
            <mailet match="All" class="Bounce">
                <attachment>none</attachment>
            </mailet>
            <mailet match="All" class="ToRepository">
                <repositoryPath>cassandra://var/mail/address-error/</repositoryPath>
            </mailet>
        </processor>

        <processor state="relay-denied" enableJmx="true">
            <mailet match="All" class="MetricsMailet">
                <metricName>mailetContainerRelayDenied</metricName>
            </mailet>
            <mailet match="All" class="Bounce">
                <attachment>none</attachment>
            </mailet>
            <mailet match="All" class="ToRepository">
                <repositoryPath>cassandra://var/mail/relay-denied/</repositoryPath>
                <notice>Warning: You are sending an e-mail to a remote server. You must be authenticated to perform such an operation</notice>
            </mailet>
        </processor>

        <processor state="bounces" enableJmx="true">
            <mailet match="All" class="MetricsMailet">
                <metricName>bounces</metricName>
            </mailet>
            <mailet match="All" class="DSNBounce">
                <passThrough>false</passThrough>
            </mailet>
        </processor>

        <processor state="rrt-error" enableJmx="false">
            <mailet match="All" class="ToRepository">
                <repositoryPath>cassandra://var/mail/rrt-error/</repositoryPath>
                <passThrough>true</passThrough>
            </mailet>
            <mailet match="IsSenderInRRTLoop" class="Null"/>
            <mailet match="All" class="Bounce"/>
        </processor>

    </processors>

</mailetcontainer>