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https://issues.apache.org/jira/browse/JAMES-2896?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benoit Tellier closed JAMES-2896.
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Resolution: Won't Fix
Long term plan is to migrate to pulsar...
> RabbitMQ MailQueue should support delays
> ----------------------------------------
>
> Key: JAMES-2896
> URL: https://issues.apache.org/jira/browse/JAMES-2896
> Project: James Server
> Issue Type: Improvement
> Components: Queue, rabbitmq
> Reporter: Benoit Tellier
> Priority: Major
> Labels: feature
>
> MX (mail exchange) servers do rely on delays for some things like spam and
> abuse detection thus this is a critical capability for a mail queue component
> of a server aiming at being used as an MX.
> So far, RabbitMQ mail queue does not support delays. Its usage is then
> discouraged within an MX server (though it is perfectly suited for an MDA).
> We can relatively easily implement delays within the RabbitMQ mail queue:
> - When a delay is specified, we save the message in the object storage,
> fire a message on a **MailQueueDelayExchange**, and persist it on the
> MailQueueView.
> - Each James listens on a single Queue plugged to the
> **MailQueueDelayExchange**.
> - For each incoming message, the receiver will position a timer until
> the planned delivery (date).
> - Upon timer completion, we ack the message of MailQueueDelayExchange,
> then we put the corresponding message in the mail RabbitMQMailQueue (no
> need to update the mailQueueView nor store again the blob).
> - Upon connection loss, the message will be nacked and will be then
> handled by another s/consumer/jamesServer/.
> Obviously:
> - We need synchronized clocks "best-effort" - think NTP
> - This solution can duplicate emails upon connection loss - a local
> James needs to invalidate the entries he is waiting for upon connection loss.
> - **flush** needs to be broadcasted so that all James servers can release
> the retained delayed emails into the mail queue.
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