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https://issues.apache.org/jira/browse/JAMES-4097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benoit Tellier closed JAMES-4097.
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Resolution: Fixed
> Allow cross-domain sharing of mailboxes via config
> --------------------------------------------------
>
> Key: JAMES-4097
> URL: https://issues.apache.org/jira/browse/JAMES-4097
> Project: James Server
> Issue Type: Improvement
> Components: mailbox
> Reporter: Felix
> Priority: Minor
>
> As discussed on the server-dev mailing list (subject: `Shared mailboxes via
> IMAP`), we think that the current single-domain restriction for mailbox
> sharing is too strict for some use cases.
> The restriction prevents that a mailbox of one domain can be shared with
> users of another domain and was introduced with
> [#318|https://issues.apache.org/jira/browse/MAILBOX-318].
> This is one of multiple security layers to prevent unauthorized access to a
> mailbox. In a multi-tenancy deployment, users of different tenants cannot
> access other mailboxes because of missing ACL rights and the cross-domain
> restriction serves as a fallback barrier.
> However, there are also companies using different domains (e.g. it's common
> to have a `student.` domain in universities) where collaboration between
> users of different domains via shared mailboxes would be helpful.
> To not influence existing deployments and keep the security benefit for
> default deployments, we propose to add a configuration switch (by default
> disabled) to allow sharing of mailboxes across domain boundaries.
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