Chapter 3. Tune sendmail with Compile-Time Macros
For most users, the default sendmail that is produced by running Build will be perfectly suitable. For others, however, support for certain desirable features will have to be added, such as hesiod, ldap, or nis as a means to validate users and route mail. The open source distribution of sendmail has many such features that you can choose to include or to exclude from your compiled binary.
All the features described in this chapter are implemented as
compile-time #define macros that are passed to the
compiler with appropriate -D switches. Your
m4 file is the proper place to put in such
definitions. For example, to remove support for wildcard matches in
the password(5) file from
sendmail, you should:
APPENDDEF(`conf_sendmail_ENVDEF', `-DMATCHGECOS=0')
A new line is added to your Build
m4 file that adds the complier flag
-DMATCHGECOS=0, which turns off support for
wildcard matches.
All the latest available -D compile-time macro
values will be listed in the sendmail/README
file. Those that we cover are listed in this book in Table 3-2.
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