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+qmail-smtpd Receive message by SMTP from another host:
+
+ | MAIL FROM:<joe@heaven.af.mil>
+ | RCPT TO:<bill@irs.gov>
+ |
+ | Is $RELAYCLIENT set? Yes: "".
+ | Accept RCPT.
+ 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? No.
+ Look up DNS MX/A for irs.gov and connect to it by SMTP:
+
+ MAIL FROM:<joe@heaven.af.mil>
+ RCPT TO:<bill@irs.gov>