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https://issues.apache.org/jira/browse/JAMES-3396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17207971#comment-17207971
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René Cordier commented on JAMES-3396:
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[https://github.com/linagora/james-project/pull/3846] fixed this
> RRT loops (partial) avoidance!
> ------------------------------
>
> Key: JAMES-3396
> URL: https://issues.apache.org/jira/browse/JAMES-3396
> Project: James Server
> Issue Type: Bug
> Components: RRT
> Reporter: Benoit Tellier
> Priority: Major
>
> # Why ?
> On some production plateform, some users could not receive new mails.
> Investigation prouved that it was due to loops (A => B => A)
> # Definition of Done
> {code:java}
> Given a A => B mapping
> As an admin
> When I create a B => A mapping
> Then the operation fails
> {code}
> Unit tests needs to be written at the RRT level, and at the webadmin routes
> level for each mapping type (Alias, address, forward, group) with
> heteronegeous / homogeneous mappings being part of the loop. Domain mappings,
> Regex needs to be supported as part of theresolution mechanism.
> However detecting loops upon domain mapping/alias & regex mapping creation is
> out of scope.
> This validation and its limitations needs to be documented.
> # How
> {code:java}
> Given a B => A mapping being created
> Attempt the RRT resolution of the target of the mapping (here A)
> If the result of the resolution contains the source of the mapping (here B)
> then we detected a loop and should fail
> {code}
> # Outcome
> Creation of Address Alias Forward Group mappings is guaranteed to be loop
> free.
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