[exim] cutthrough, defer condition = $recipients_count => co…

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Autor: Heiko Schlittermann
Datum:  
To: exim-users
Betreff: [exim] cutthrough, defer condition = $recipients_count => co0
Hello,

I'm trying to limit the number of recipients of an incoming message in
order to make cutthrough delivery working (since it works with one
recipient only, currently).

I've setup the rcpt acl:

    defer domains = example.com
          condition = $recipients_count


    warn  domains = example.com
          control = cutthrough_delivery




    accept


Sending now to two recpiens:

    …
    -> RCPT TO:<peter.[hidden]@foo.[hidden].de>
    <-  250 Accepted
    -> RCPT TO:<foo@foo.[hidden].de>
    <** 451 Temporary local problem - please try later      <--- expected
    -> DATA
    …
    <-  250 OK id=1XqMmX-0004fk-Fe


Here the log:

1XqMmX-0004fk-Fe <= hs@??? H=hh.schlittermann.de [213.128.132.49] P=esmtp S=931 T="test Mon, 17 Nov 2014 14:55:53 +0100" from <hs@???> for peter.[hidden]@foo.[hidden].de
1XqMmX-0004fk-Fe => peter.[hidden]@foo.[hidden].de F=<hs@???> P=<hs@???> R=rr_exchange ...
1XqMmX-0004fk-Fe Completed QT=2s

Note the '=>' in front of the recipient, no indication of cutthrough.

Sending the message to just one recipient works as expected, the '>>'
appears in the log, indicating cutthrough delivery.

What's wrong here? (Using condition = ${if >{$rcpt_count}{1}} doesn't
change the result.)

I know that cutthrough routing is dropped if there is any subsequent
recipient, but if I do not allow subsequent recipients, I'd expect the
cutthrough setup to remain.

    Best regards from Dresden/Germany
    Viele Grüße aus Dresden
    Heiko Schlittermann
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