7.18 on page 930. To enable suchmaps, you can add a line suchas the following to
your Build m4 file:
APPENDDEF(`confMAPDEF??, `-DPH_MAP??)
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 PH_MAP support is
defined (if it appears in the list, it is defined).
3.4.42 PICKY_HELO_CHECK
Make sendmail picky about HELO Tune with confENVDEF
The SMTP HELO command is used to introduce the calling machine to the receiving
machine. The form of that command is:
HELO calling hostname here
Note that HELO and EHLO are equivalent in this regard. Ordinarily, sendmail doesn??™t care
what the calling host calls itself. All sendmail cares about is that this name is the canonical
name of a machine. If you care whether the HELO hostname matches the real hostname of
the calling machine, you can add a line such as the following to your Build m4 file:
APPENDDEF(`confENVDEF??, `-DPICKY_HELO_CHECK??)
With PICKY_HELO_CHECK defined, a mismatch (other than the local machine calling
itself localhost) will cause the following warning to be logged:
Host realname claimed to be heloname
Note that this check is ordinarily turned off because a large number of hosts on the Internet
use a name that is different from their canonical name.*
3.4.43 PIPELINING
Enable PIPELINING SMTP extension Tune with confENVDEF
RFC2920 defines an SMTP extension called ???pipelining.
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