[courier-users] Maildrop delivery file name

[<qm...@to...>]

I'm using Courier-MTA with a custom implementation of Qmail/Vpopmail  
and I am also using Maildrop.

Part of the custom features that we have is that the name of the final  
file to be stored in the Maildir has some flags appended to it. The  
last part of the filename usually is: ,S=<size>:2

In our case, we have more flags after the 2, like this: ,S=<size>:2,abc

This allows us to tag/label certain messages directly from delivery.  
This works great when Vpopmail does the final delivery because it's  
able to save the file using this exact name and the flags are preserved.

The problem appears when we use Maildrop because Maildrop completely  
re-calculates the final file name and thus erases our custom flags.

Is there a way to influence from within the Maildrop filter script  
what the final file name will be ? The e-mail message itself contains  
certain headers, and we could search for those using Maildrop, but we  
need to tell it what the final file name should be.

Thanks!