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Create Milter Support

Milters are external programs that run separately from sendmail, but communicate with sendmail using a special API called the Milter API. Thus, support must be included inside sendmail before you may use any Milter at all. In this section, we discuss the support you must set up:

Prior to V8.13 sendmail, use the -DMILTER Build switch to enable Milter support inside sendmail.
Build and install the libmilter library for use by Milters.

The libmilter library is needed only if you intend to write (or download and build) your own Milter. If you purchase a prebuilt Milter, you may not need to build the libmilter library.

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