qmail-lspawn - schedule local deliveries
reads a series of local delivery commands from descriptor 0,
to perform the deliveries, and prints the results
to descriptor 1. It passes defaultdelivery
default delivery instruction.
asynchronously, so the results
may not be in the same order as the commands.
For each recipient address, qmail-lspawn
finds out which local user
controls that address. It first checks the qmail-users
the address is not listed there, it invokes qmail-getpw
then runs qmail-local
under the user's uid and gid.
It does not set up any supplementary groups.
treats an empty mailbox name as a trash address.
envelopes(5), qmail-users(5), qmail-getpw(8), qmail-send(8),