GNU Mailutils
	General-Purpose Mail Package	Official GNU Software

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3.2.3 The include Statement

A special statement is provided that causes inclusion of the named file. It has the following syntax:

include file;

When reading the configuration file, this statement is effectively replaced with the content of file. It is an error if file does not exist.

In site-wide configuration file, file can be a directory name. In this case, Mailutils will search this directory for a file with the same name as the utility being executed. If found, this file will be loaded.

It is a common to end the site-wide configuration file with an include statement, e.g.:

include /etc/mailutils.d;

This allows each particular utility to have its own configuration file. Thus, imap4d will read /etc/mailutils.d/imap4d, etc.