[exim] Transport_filter and first delivery

[derti]

I have been messing around with the transport filter facility for a bit 
and am having trouble with proper usage of the first_delivery 
condition,  I realize it is common to use it in system filters but I 
haven't found any solid examples where first_delivery is in the 
transport_filter line.   Currently my transport filter line looks like this:

transport_filter = /bin/el_dksign -o /etc/el_dksign.conf -d 
${authenticated_id} -r "${if first_delivery {-l/var/log/el_dksign.log}{}}"

the probem i am having is that when a message fails to be delivered like 
this

2005-05-13 14:41:30 1DWg2L-0003bV-6q <= [EMAIL PROTECTED] ....S=334 from ... 
for ....
2005-05-13 14:41:30 1DWg2L-0003bV-6q Remote host mx2.mail.yahoo.com 
[4.79.181.13] closed connection in response to end of data
2005-05-13 14:41:33 1DWg23-0003bN-S3 mx1.mail.yahoo.com [4.79.181.12]: 
Connection timed out

it gets immediatly retried?? (isn't this the second delivery attempt?)
2005-05-13 14:41:34 1DWg2L-0003bV-6q => .... R=dnslookup T=remote_smtp 
S=525 H=mx2.mail.yahoo.com [67.28.114.35] C="250 ok dirdel"
2005-05-13 14:41:34 1DWg2L-0003bV-6q Completed

and is delivered.  Now the external program that I use in the 
transport_filter has a seperate logfile (the -l option), and I only want 
to log once for that message, I thought the first_delivery condition 
would fix that but it still logged it twice.  So am I misunderstanding 
the usage of first_delivery?

anyone have any suggestions?
Tim
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