Retry when pipe command times out

[croft...@gmail.com]

We have postfix to deliver local mail through a pipe command that
accesses a database. If the database server crashes, the command is
hanging and postfix eventually logs the following error "warning:
pipe_command_read: read time limit exceeded" and then bounces an error
message bac k to the sender.

Is it possible to have postfix retry delivery by the command command
rather than immediately bounce a permanent failure?

Thanks.

[qui...@skywalk.co.za]

try adding the -o soft_bounce=yes option

foobar unix - n n - - pipe
-o soft_bounce=yes
flags=RF user=foobar:foobar argv=command-line

note that this will cause it to retry forever. failed messages never get bounced again.