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Thx Stefan,

I have written and setup custom transports before (autoreply, sms) so I had no trouble setting up a dedicated 'chello' transport with, to be abs. sure, only 1 maxproc:

master.cf:
chello      unix  -       -       -       -       1       smtp

main.cf, with some of the tips from the page you linked:
chello_destination_rate_delay = 1
chello_destination_concurrency_failed_cohort_limit = 100
chello_destination_concurrency_limit = 1


I added a [chello.nl -> chello:] mapping to the SQL back-end and a [EMAIL PROTECTED] -> @chello.nl] virtual mapping to fix the unknown local user (550) error.

However, I don't see the transport being used. We have a common setup, where mail is first sent to the content filter and then sent back to Postfix. It seems that the mail goes straight from lmtp to qmgr, without activating the new chello transport. Note, that there has already been a virtual mapping.

After a 'postsuper -r ALL deferred' I still don't see any evidence in the logs of the transport being used. I feel there is a solutino here, but postfix just isn't using it ;)

Any thoughts? Thx much!
Samy Ascha

On Oct 30, 2008, at 12:52 PM, Stefan Förster wrote:
The document available at
http://www.postfix.org/QSHAPE_README.html#backlog
shows how to define a dedicated transport for one specific
destination, how to play around with concurrency and the number of
smtp delivery agents available, makes remarks about the use of static
connection caching and so on. You cannot copy/paste the example given
there, but it should show you how you can approach this problem.

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