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https://issues.apache.org/jira/browse/JAMES-3081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17052715#comment-17052715
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René Cordier commented on JAMES-3081:
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[https://github.com/linagora/james-project/pull/3164] contributed to this
> Make messages persistent in rabbitmq mailqueue
> ----------------------------------------------
>
> Key: JAMES-3081
> URL: https://issues.apache.org/jira/browse/JAMES-3081
> Project: James Server
> Issue Type: Improvement
> Reporter: Rémi Kowalski
> Priority: Major
>
> Regarding the persistence of messages in rabbitmq : To achieve this there are
> two steps :
> the queue must be declared as durable (the declaration of the queue is
> persisted rabbitmq is restarted)
> when sending a message, it must have a property setting its delivery_mode to
> persistent. (the messages with this property are persisted in case of a
> restart of rabbitmq)
> At the time being the rabbitmq mailqueue in james :
> the queue is declared durable => Good
> the delivery_mode property is not set => Not good
> the exchange is durable => Good
> What should be done is :
> set the `delivery_mode` property to '2' ( see
> [https://www.rabbitmq.com/releases/rabbitmq-java-client/v2.4.1/rabbitmq-java-client-javadoc-2.4.1/index.html?com/rabbitmq/client/MessageProperties.html]
> )
>
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