1                Original message:
2
3                   To: fred
4                   Hi.
5
6qmail-inject    Fill in the complete envelope and header:
7
8     |             (envelope) from joe@heaven.af.mil to fred@heaven.af.mil
9     |             From: joe@heaven.af.mil
10     |             To: fred@heaven.af.mil
11     |
12     |             Hi.
13     V
14
15qmail-queue     Store message safely on disk.
16                Trigger qmail-send.
17     |
18     V
19
20qmail-send      Look at envelope recipient, fred@heaven.af.mil.
21     |          Is heaven.af.mil in locals? Yes.
22     |          Deliver locally to fred@heaven.af.mil.
23     V
24
25qmail-lspawn ./Mailbox
26
27     |          Look at mailbox name, fred.
28     |          Is fred listed in qmail-users? No.
29     |          Is there a fred account? Yes.
30     |          Is fred's uid nonzero? Yes.
31     |          Is ~fred visible to the qmailp user? Yes.
32     |          Is ~fred owned by fred? Yes.
33     |          Give control of the message to fred.
34     |          Run qmail-local.
35     V
36
37qmail-local fred ~fred fred '' '' heaven.af.mil joe@heaven.af.mil ./Mailbox
38
39                Does ~fred/.qmail exist? No.
40                Write message to ./Mailbox in mbox format.
41