messageid in submit_sm_resp, very useful

Dear Kannel Devel,

Is the Kannel Devel team looking at passing the message_id received by
Kannel in the submit_sm_resp back as part of the DLR.
In the Kannel users list (Thu 11/18/2004 8:18 AM) - Peter Beckman suggested
using %m as the Escape Code as it's not used.

This would be very useful as my SMS provider requests I give the message_id
to track the status of the SMS if it's not delivered and
I can't do this as I only receive the message_id in the final dlr which may
never arrive.

Thanks for your help.