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On Fri, 23 Jan 2015, Stéphane Cottin wrote:
I'm using qmail + dspam + dovecot-lda.
A typical .qmail file :
| /usr/bin/dspam --client --deliver=stdout --user "$EXT@$USER" | /usr/bin/preline -f
/usr/lib/dovecot/dovecot-lda -d "$EXT@$USER" -a "$EXT@$USER" -m "$EXT2"
When dspam segfault or is killed, preline receive an empty content and only
pass to dovecot-lda two headers ( Return-Path and Delivered-To ).
Those two lines are generated by dovecot-lda or preline.
Then dovecot-lda delivers successfully and the original message contents are
lost.
Should dovecot-lda returns an error in such conditions ( invalid contents ) ?
Qmail will keep it in the queue and retry delivery later.
That's the problem of the used Unix pipe and broken by design. The right
member of the pipe (preline) runs independendly of dspam and recieves no
content via pipe. Why should preline or dovecot-lda believe there is an
error?
If preline does not have no nifty option to prevent this, replace the
pipe by a shell script:
| /usr/local/bin/dspam-lda-wrapper.sh "$EXT@$USER" "$EXT2"
===== /usr/local/bin/dspam-lda-wrapper.sh
#!/bin/bash
tmpf="/tmp/wrapper.$$.log"
trap 'rc=$?; rm -f $tmpf; exit $rc' EXIT
if /usr/bin/dspam --client --deliver=stdout --user "$1" >$tmpf; then
test -s $tmpf && /usr/bin/preline -f \
/usr/lib/dovecot/dovecot-lda -d "$1" -a "$1" -m "$2" <$tmpf
fi
======
- --
Steffen Kaiser
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