qmail-smtpd Receive message by SMTP from another host:
| MAIL FROM:<[email protected]>
| RCPT TO:<[email protected]>
|
| Is $RELAYCLIENT set? Yes: "".
| Accept RCPT.
V
qmail-queue Store message safely on disk.
Trigger qmail-send.
|
V
qmail-send Look at envelope recipient, [email protected]. | Is irs.gov in locals? No. | Is [email protected] in virtualdomains? No. | Is irs.gov in virtualdomains? No. | Is .gov in virtualdomains? No. | Deliver remotely to [email protected]. 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:<[email protected]>
RCPT TO:<[email protected]>