[exim-dev] [Bug 1201] New: forwarding to a content-scanning …

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http://bugs.exim.org/show_bug.cgi?id=1201
           Summary: forwarding to a content-scanning site is a bounce-
                    generator
           Product: Exim
           Version: 4.77
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: wishlist
          Priority: low
         Component: Delivery in general
        AssignedTo: nigel@???
        ReportedBy: jgh146exb@???
                CC: exim-dev@???

Created an attachment (id=535)
--> (http://bugs.exim.org/attachment.cgi?id=535)
Basic cutthrough routing

The modern world of spammers faking envelope-from combined with antispam
defences doing content-scanning, combined with 2MX service provided by
separately maintained systems, results in a bounce problem.

The attached patches implement an SMTP cutthrough-routing to attack the issue.
The implementation is limited to best-effort, falling back to store-and-forward
on error and on >1 (possibly routing-introduced) recipient. Is is triggered by
a new "control=" recipient-ACL modifier.

The basic facility is added by the "cutthrough" patch, which goes on top of the
refactoring patch offered for bug 1184. The "dual-tls" patch extends the
facility to make TLS connections where appropriate for the delivery.


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