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https://issues.apache.org/jira/browse/JAMES-4213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18091765#comment-18091765
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Benoit Tellier commented on JAMES-4213:
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Hello Felix
As said on Github we have customer that has RRT not actually pointing to real
users. Though the mail shall be ingested and treated,
This proposal would defeat what they consider a feature.
As such I would propose we make this an opt-in extra check, disabled by default.
Would this be OK to you?
> ValidRcptHandler does not properly check aliases
> ------------------------------------------------
>
> Key: JAMES-4213
> URL: https://issues.apache.org/jira/browse/JAMES-4213
> Project: James Server
> Issue Type: Bug
> Components: SMTPServer
> Reporter: Felix
> Priority: Minor
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Currently, it is only checked if the recipient is a user or if there is a
> mapping with the recipient as source. It is not checked that this mapping
> actually points to a local mailbox.
> We do not want to accept emails that go directly to an error repository, so
> this should be caught after the SMTP RCPT command.
> I would be in favor to enforce that all targets it resolves to are valid but
> that may break some poorly maintained groups, I guess.
> The alternative is to to accept a recipient if it resolves to at least one
> mailbox that is present.
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