lockfile and qmail

hi!

I had a small doubt that has been worrying me for quite some time.

I use procmail to sort mail which I call from a script using cron().  My
Mail Delivery Agent is qmail. 

If I use lockfile to lock my system mailbox (which is $HOME/Mailbox) then
will qmail take note of it and queue up deliveries? 

qmail queues mail if the sticky bit for $HOME is set. 

Please mail me back as I do not subscribe to this mailing list. 

Thanx a lot for any help
karthik