A rule elsewhere in the configuration file tells sendmail to associate any mail to anyone
at slowsite.com withth at queue group. Queue groups are described in detail in
?§11.4 on page 408.
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1.8 The sendmail.cf File | 37
1.8.4.14 External filter programs
Beginning unofficially withV8.10, and officially withV8.12 sendmail, it is possible to
filter all inbound messages through an external filter program. The default filter program
is called milter(8), and is described in ?§26.1 on page 1170.
The X configuration command (?§26.2.1 on page 1173) allows you to tune the way
external filters are used. In the following example, the first filter tried will use the
Unix socket /var/run/f1.sock, and will reject the message (the F=R) if the filter cannot
be accessed:
Xfilter1, S=local:/var/run/f1.sock, F=R
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
PART I
I.Administration
Chapter 2, Download, Build, and Install
Shows where and how to obtain the source and how to build and install
sendmail.
Chapter 3, Tune sendmail with Compile-Time Macros
Describes the many compile-time macros used to tune sendmail.
Chapter 4, Maintain Security with sendmail
Shows many ways to avoid security problems.
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