qreason
Here, the reason can be manually inserted using sendmail??™s command line, or automatically
inserted via the access database or rule sets.
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454 | Chapter 11: Manage the Queue
11.12.15 Q line
The DSN ORCPT address V8.7 and later
When a mail message arrives that includes an ORCPT parameter for the ESMTP RCPT
command (see RFC1891), sendmail needs to save that parameter??™s information separately
from the RCPT recipient address:
RCPT To:
ORCPT=rfc822;gw@wash.dc.gov
?†‘ ?†‘
recipient address parameter??™s information
Not all sites understand DSN. If sendmail forwards the message to such a site, it needs to
omit the ORCPT parameter. Consequently, sendmail must not store that parameter with
the RCPT address.
The Q line is used to separately store the ORCPT parameter information:
Qtype;addr
The type;addr is defined by RFC1891. The sendmail program checks the syntax of addr
when that information is received, but otherwise merely stores type;addr as is in the Q line.
There must be only a single Q line for eachrecipient R line, and eachsuch Q line must
precede its corresponding R line.
11.12.16 r line
Final-Recipient DSN address V8.10 and later
When sendmail bounces a mail message, it does so using DSN (?§20.
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