is it possible to add a delevered-to header

[ram]

I want to use a cyrus-mailbox as a multidrop box for our one client. The
local delivery is done by fetchmail which requires a delivered-to header
for multidrop boxes

Can I configure lmtp to add an X-delivered-to header 
I know this may break the single instance storage functionality , But
supose I want to opt out is this possible. 



Thanks
Ram