Name
${dsn_notify}
Synopsis
When sendmail receives a message via SMTP, it can also receive information about how it should handle a bounce. That information is included as part of an envelope-sender declaration:
RCPT To:<address> NOTIFY=how
Here, the RCPT TO: command specifies an envelope
recipient’s address. Following that address is the
keyword NOTIFY=, followed by one or more of four possible keywords:
success
, failure
,
never
, and delay
(see -N for a more complete description of NOTIFY= and
its keywords).
The keywords specified are made the value of the
${dsn_notify}
macro. If no NOTIFY= is specified,
the ${dsn_notify}
macro is undefined (NULL). If
multiple RCPT TO: commands are issued during a single SMTP session,
each command will update the ${dsn_notify}
macro
in turn, overwriting the prior RCPT TO: command’s
value.
The ${dsn_notify}
macro is also given a value if
the -N
command-line switch (-N) is used to set the NOTIFY= keyword during
mail submission.
One use for this ${dsn_notify}
macro might be to
log every instance when notification of success is requested. One way
to do this is with a syslog
map in the
check_compat
rule set:
LOCAL_CONFIG Klog syslog -D -LNOTICE LOCAL_RULESETS Scheck_compat R$* $: $&{dsn_notify} $| $1 Rsuccess $| $* $| $* $: $(log dsn=success, recipient=$2, sender=$1 $)
Here, we declare a syslog
map (syslog) with the K
configuration
command (Section 23.2) in the LOCAL_CONFIG part of
your mc
file. The -D
tells
sendmail to not syslog if the message is being ...
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