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https://issues.apache.org/jira/browse/JAMES-4171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18057576#comment-18057576
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Jean Helou commented on JAMES-4171:
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Interesting, it means that the default configuration results in DSN sent by
james for unauthenticated users. I was unaware of this particular behavior,
never thought to actually check it.
It means I could impersonate anyone and flood their inbox with DSNs by
pretending to be someone I'm not trying to relay through a james instance.
instead of changing the <auth> section, shouldn't we create a handler, applied
by default which applies a sane behavior by default and can be configured to be
even stricter ?
By sane behavior by default I mean reject non-authenticated users trying to
relay to non local recipients at the SMTP layer.
The handler would have a flag to completely disallow unauthenticated traffic.
People who want to do custom risky stuff would explicitly disable this handler
and use mailetcontainer to do their stuff
> Submission only server
> ----------------------
>
> Key: JAMES-4171
> URL: https://issues.apache.org/jira/browse/JAMES-4171
> Project: James Server
> Issue Type: Improvement
> Components: SMTPServer
> Reporter: Benoit Tellier
> Priority: Major
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> h3. Context
> I end up having to provide a submission only server for one of my customer.
> Problem: James bundles together the MX and submission role thus always accept
> email of remote users addressed to local users.
> This unorthodox behaviour is not a problem when combining both roles (though
> surprising!) however not being able to say "only authenticated users here"
> prevents implementing the aformentionned use case
> h3. Proposal
> Add auth.required configuration option in SMTP
> If true, then discard unauthenticated senders.
> This shall be the documented + recommended value however for
> retro-compatibility I propose to keep the legacy value as a default value.
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