6 qmail-inject Fill in the complete envelope and header:
8 | (envelope) from joe@heaven.af.mil to bill@irs.gov
9 | From: joe@heaven.af.mil
15 qmail-queue Store message safely on disk.
20 qmail-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.
28 qmail-rspawn Run qmail-remote.
33 qmail-remote Look at host name, irs.gov.
34 Is irs.gov listed in smtproutes? Yes: ":bigbang.af.mil".
35 Look up DNS A for bigbang.af.mil and connect by SMTP:
37 MAIL FROM:<joe@heaven.af.mil>
38 RCPT TO:<bill@irs.gov>