+ Original message:
+
+ To: dude@tommy.gov
+ Hi.
+
+qmail-inject Fill in the complete envelope and header:
+
+ | (envelope) from joe@heaven.af.mil to dude@tommy.gov
+ | From: joe@heaven.af.mil
+ | To: dude@tommy.gov
+ |
+ | Hi.
+ V
+
+qmail-queue Store message safely on disk.
+ Trigger qmail-send.
+ |
+ V
+
+qmail-send Look at envelope recipient, dude@tommy.gov.
+ | Is tommy.gov in locals? No.
+ | Is dude@tommy.gov in virtualdomains? No.
+ | Is tommy.gov in virtualdomains? Yes: "tommy.gov:fred".
+ | Deliver locally to fred-dude@tommy.gov.
+ V
+
+qmail-lspawn ./Mailbox
+
+ | Look at mailbox name, fred-dude.
+ | Is fred-dude listed in qmail-users? No.
+ | Is there a fred-dude account? No.
+ | Is there a fred account? Yes.
+ | Is fred's uid nonzero? Yes.
+ | Is ~fred visible to the qmailp user? Yes.
+ | Is ~fred owned by fred? Yes.
+ | Give control of the message to fred.
+ | Run qmail-local.
+ V
+
+qmail-local fred ~fred fred-dude - dude tommy.gov joe@heaven.af.mil ./Mailbox
+
+ Does ~fred/.qmail-dude exist? No.
+ Does ~fred/.qmail-default exist? Yes: "./Mail.tommy".
+ Write message to ./Mail.tommy in mbox format.