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qmail-smtpd Receive message by SMTP from another host:
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| MAIL FROM:<joe@heaven.af.mil>
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| RCPT TO:<bill@irs.gov>
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| Is $RELAYCLIENT set? Yes: "".
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| Accept RCPT.
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V
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qmail-queue Store message safely on disk.
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Trigger qmail-send.
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V
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qmail-send Look at envelope recipient, bill@irs.gov.
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| Is irs.gov in locals? No.
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| Is bill@irs.gov in virtualdomains? No.
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| Is irs.gov in virtualdomains? No.
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| Is .gov in virtualdomains? No.
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| Deliver remotely to bill@irs.gov.
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21 |
V
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qmail-rspawn Run qmail-remote.
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V
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qmail-remote Look at host name, irs.gov.
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Is irs.gov listed in smtproutes? No.
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Look up DNS MX/A for irs.gov and connect to it by SMTP:
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MAIL FROM:<joe@heaven.af.mil>
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RCPT TO:<bill@irs.gov>
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