Content Filter problem

Hi

I have a problem with a custom C coded post queue content filter
which on rare occasions dies with signal 6 due to corrupted free() pointers.
This always results in an immediate bounce of the message.

I would like the offending message to stop in the deferred queue so I can
examine
the message and debug the content filter problem. How can I achieve this?
I have tried -o soft_bounce=yes in the smtpd options but this does not
defer the message
and it is bounced immediately

I am using Debian postfix 2.5.5-1

Regards Paul Enlund

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