1                Original message:
2
3                   To: bill@irs.gov
4                   Hi.
5
6qmail-inject    Fill in the complete envelope and header:
7
8     |             (envelope) from joe@heaven.af.mil to bill@irs.gov
9     |             From: joe@heaven.af.mil
10     |             To: bill@irs.gov
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, bill@irs.gov.
21     |          Is irs.gov in locals? No.
22     |          Is bill@irs.gov in virtualdomains? No.
23     |          Is irs.gov in virtualdomains? No.
24     |          Is .gov in virtualdomains? No.
25     |          Deliver remotely to bill@irs.gov.
26     V
27
28qmail-rspawn    Run qmail-remote.
29
30     |
31     V
32
33qmail-remote    Look at host name, irs.gov.
34                Is irs.gov listed in smtproutes? No.
35		Look up DNS MX/A for irs.gov and connect to it by SMTP:
36
37                   MAIL FROM:<joe@heaven.af.mil>
38                   RCPT TO:<bill@irs.gov>
39