ident=0 by default
APPENDDEF(`confENVDEF??, `-DIDENTPROTO=1??) ?†? set Timeout.ident=30 by default
If you are running a precompiled sendmail binary, you can use the -d0.10 debugging
command-line switch (?§15.7.3 on page 543) to determine whether IDENTPROTO support
is defined (if it appears in the list, it is set to 1). New ports should be reported to sendmail@
sendmail.org so that they can be folded into future releases.
3.4.16 IP_SRCROUTE
Add IP source-routing to $_ Tune with confENVDEF
Mail is normally transported over networks withTCP/IP. At the IP layer, packets are
usually constructed to be point-to-point??”from one host to another. IP packets can also be
constructed to contain source-routing information??”from one host, through a second, then
to a final host.
Although such source routing (when used) is generally legitimate, it can also be used to
generate fraudulent mail. V8.7 and above sendmail attempt to extract source-routing information
from the initial connection??™s IP information. If any is found, sendmail adds that
information to the $_ defined macro (?§21.9.1 on page 801) for use in the Received: header
(?§25.12.30 on page 1162). The $_ defined macro is usually used like this:
Received: from $s ($_) ...
where $_ will contain information such as the following when IP source-routing information
is found:
IP source-routing information
?†“
user@host.
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