Victor Duchovni: > [ Wietse is it safe to move queue files active -> hold -> incoming in > a short time? Could some recipients be delivered twice by two delivery > agents in parallel (both deliveries starting after the second incoming > to active transition)? ]
Each delivery agent holds a read lock on the file that it delivers
mail from. This will keep the queue manager from scheduling new
deliveries. The mechanism prevents duplicate deliveries after
"postfix reload" + "postfix flush".
Wietse
