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4.25 Dynamically Loaded Modules

Native mailfromd modules described above rely on the functions provided by the mailfromd binary. For more sophisticated tasks you might need to use C functions, either for efficiency reasons or to make use of some third-party library. This is possible using special kind of modules called mfmod.

An mfmod consists of two major parts: a dynamically loaded library that provides its main functionality and a small interface mailfromd module. The convention is that for the module x the library is named mfmod_x.so19, and the interface module file is x.mfl.

At the time of this writing, three mfmods exist:


Provides support for Perl-compatible regular expressions. It also contains a special function for scanning an email message for a match to a regular expression. See Mfmod_pcre in Mfmod_pcre.


Functions for searching in LDAP directory. See Mfmod_ldap in Mfmod_ldap.


Openmetrics support for mailfromd. See mfmod_openmetrics in mfmod_openmetrics reference.

The subsections below describe the internal structure of an mfmod in detail.



The actual suffix depends on operating system. It is ‘.so’ on all POSIX systems.