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 may choose to include or 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 on page
105.
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