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https://issues.apache.org/jira/browse/MAILBOX-373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16796696#comment-16796696
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Tellier Benoit commented on MAILBOX-373:
----------------------------------------

https://github.com/linagora/james-project/pull/2241 made this api concurrent 
safe by generating insertion ids

> Dead letter API + Contract + Memory default implemetation
> ---------------------------------------------------------
>
>                 Key: MAILBOX-373
>                 URL: https://issues.apache.org/jira/browse/MAILBOX-373
>             Project: James Mailbox
>          Issue Type: New Feature
>            Reporter: Trần Tiến Đức
>            Priority: Major
>             Fix For: 3.3.0
>
>
> From MAILBOX-372 :
>  
> When the EventBus maxRetry is exceeded on a MailboxListner execution is 
> exceeded we will store it in the **EventDeadLetter**.
> The goal of this ticket is to define this API in `mailbox/api`, propose its 
> test contract and a default implementation, memory based, exposed in 
> `mailbox/event/memory`.
> Please note that it should have a `MultiMap<Group, Event>` structure: given a 
> listener, give me the failed events.
> This allows:
>  - audit.
>  - To schedule a redelivery (very usefull for instance when ElasticSearch is 
> crashed)



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