[exim] Ability to detect when a "defer_ok" has been triggere…

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Autor: Eli
Data:  
A: exim-users
Assumpte: [exim] Ability to detect when a "defer_ok" has been triggered?
I've had some comments in my Exim config for a while now with the intent of
one day being able to detect if a malware scan was successful or not, and
since I got to updating the configs now, I figured I'd see if I could do
anything about it.

This is the ACL code I have for virus scanning:

acl_check_scan:
        accept  authenticated   = *


        accept  condition       = ${if > {$message_size}{2M} {yes}{no}}


        deny    message         = Message contains malicious code:
$malware_name
                malware         = true/defer_ok
                logwrite        = Message contains malicious code:
$malware_name


        warn    message         = X-Virus-Scan: YES
#               !malware        = true/defer_ok


        accept


The commented out line was my little hint that I should do something, and
this is what I'd like to be able to do (It might be possible right now, but
I don't know how to do it)...

I would like to be able to tell users via the X-Virus-Scan: header whether a
message was indeed scanned or not - in the event of the virus scanner
failing but defer_ok still allowing the message in. From what I can tell,
this would probably only be possible if there was something like a
"deferred" variable which would allow something like this:

        warn    message         = X-Virus-Scan: ${if eq {$deferred}{0}
{YES}{NO}}
                !malware        = true/defer_ok


This would of course be useful in any other case where there's a "defer_ok"
modifier available so that people can detect the deferring.

... Or is there another way that currently exists?

Eli.