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+ Original message:
+
+ To: bill@irs.gov
+ Hi.
+
+qmail-inject Fill in the complete envelope and header:
+
+ | (envelope) from joe@heaven.af.mil to bill@irs.gov
+ | From: joe@heaven.af.mil
+ | To: bill@irs.gov
+ |
+ | Hi.
+ V
+
+qmail-queue Store message safely on disk.
+ Trigger qmail-send.
+ |
+ V
+
+qmail-send Look at envelope recipient, bill@irs.gov.
+ | Is irs.gov in locals? No.
+ | Is bill@irs.gov in virtualdomains? No.
+ | Is irs.gov in virtualdomains? No.
+ | Is .gov in virtualdomains? No.
+ | Deliver remotely to bill@irs.gov.
+ V
+
+qmail-rspawn Run qmail-remote.
+
+ |
+ V
+
+qmail-remote Look at host name, irs.gov.
+ Is irs.gov listed in smtproutes? Yes: ":bigbang.af.mil".
+ Look up DNS A for bigbang.af.mil and connect by SMTP:
+
+ MAIL FROM:<joe@heaven.af.mil>
+ RCPT TO:<bill@irs.gov>