mdw@git.distorted.org.uk Git - qmail/blob - PIC.relaygood

   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>