| 1 | qmail-smtpd Receive message by SMTP from another host: |
| 2 | |
| 3 | | MAIL FROM:<joe@heaven.af.mil> |
| 4 | | RCPT TO:<bill@irs.gov> |
| 5 | | |
| 6 | | Is $RELAYCLIENT set? Yes: "". |
| 7 | | Accept RCPT. |
| 8 | V |
| 9 | |
| 10 | qmail-queue Store message safely on disk. |
| 11 | Trigger qmail-send. |
| 12 | | |
| 13 | V |
| 14 | |
| 15 | qmail-send Look at envelope recipient, bill@irs.gov. |
| 16 | | Is irs.gov in locals? No. |
| 17 | | Is bill@irs.gov in virtualdomains? No. |
| 18 | | Is irs.gov in virtualdomains? No. |
| 19 | | Is .gov in virtualdomains? No. |
| 20 | | Deliver remotely to bill@irs.gov. |
| 21 | V |
| 22 | |
| 23 | qmail-rspawn Run qmail-remote. |
| 24 | |
| 25 | | |
| 26 | V |
| 27 | |
| 28 | qmail-remote Look at host name, irs.gov. |
| 29 | Is irs.gov listed in smtproutes? No. |
| 30 | Look up DNS MX/A for irs.gov and connect to it by SMTP: |
| 31 | |
| 32 | MAIL FROM:<joe@heaven.af.mil> |
| 33 | RCPT TO:<bill@irs.gov> |