[exim-dev] [Bug 2702] New: XCLIENT ESMTP extension

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Autor: admin
Data:  
A: exim-dev
Assumpte: [exim-dev] [Bug 2702] New: XCLIENT ESMTP extension
https://bugs.exim.org/show_bug.cgi?id=2702

            Bug ID: 2702
           Summary: XCLIENT ESMTP extension
           Product: Exim
           Version: 4.94
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: wishlist
          Priority: low
         Component: Mail Receipt
          Assignee: unallocated@???
          Reporter: jgh146exb@???
                CC: exim-dev@???


A fork of the Exim project is carrying (among others) a patch adding XCLIENT
support, per http://www.postfix.org/XCLIENT_README.html . We might consider
doing
the same. This is an inbound proxy method, like Proxy Protocol but triggered
by
an SMTP command.

The patch

https://github.com/SpamExperts/exim/commit/3798d48d73c89f7835726d31f096851f7f7fca2a
isn't immediately usable:

- Proper handling of the proxy address/port details, for logging
- We should consider re-calling the connect ACL, after deciding to accept the
XCLIENT command, to give the chance to re-evaluate connect-time decisions
with the proxy-supplied info for the connection
- Ditto re-call the helo ACL, with the HELO attribute value
- We could consider a dedicated ACL for the command, separate from the
allowed-hosts list (still needed for advertise)
- It should be a compile-time option, initially Experimental
- duplicated code: xclient_xtextdecode() vs. auth_xtextdecode()
- (nit) coding style

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