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>Appendix A. Exim Implementation</TD
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>A.1. Prerequisites</H1
><P
> For these examples, you need the <TT
CLASS="option"
>Exim</TT
> <A
HREF="gloss.html#mta"
><I
CLASS="glossterm"
>Mail Transport Agent</I
></A
>, preferrably with Tom Kistner's
<TT
CLASS="option"
>Exiscan-ACL</TT
> patch applied. Prebuilt
<TT
CLASS="option"
>Exim+Exiscan-ACL</TT
> packages exist for the most
popular Linux distributions as well as FreeBSD; see the <A
HREF="http://duncanthrax.net/exiscan-acl/"
TARGET="_top"
>Exiscan-ACL</A
>
home page for details<A
NAME="AEN1361"
HREF="#FTN.AEN1361"
><SPAN
CLASS="footnote"
>[1]</SPAN
></A
>.
</P
><P
> The final implementation example at the end incorporates these
additional tools:
</P
><P
></P
><UL
><LI
><P
> <A
HREF="http://www.spamassassin.org/"
TARGET="_top"
>SpamAssassin</A
>
- a popular spam filtering tool that analyzes mail content
against a large and highly sophisticated set of
heuristics.
</P
></LI
><LI
><P
> <A
HREF="http://packages.debian.org/unstable/mail/greylistd"
TARGET="_top"
>greylistd</A
>
- a simple greylisting solution written by yours truly,
specifically with Exim in mind.
</P
></LI
></UL
><P
> Other optional software is used in examples throughout.
</P
></DIV
><H3
CLASS="FOOTNOTES"
>Notes</H3
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>[1]</SPAN
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><P
> In particular, Exim is perhaps most popular among users of
<A
HREF="http://www.debian.org/"
TARGET="_top"
>Debian GNU/Linux</A
>,
as it is the default MTA in that distribution. If you use
Debian (<SPAN
CLASS="QUOTE"
>"Sarge"</SPAN
> or later), you can obtain
Exim+Exiscan-ACL by installing the
<TT
CLASS="option"
>exim4-daemon-heavy</TT
> package:
<TABLE
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><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
># apt-get install exim4-daemon-heavy</PRE
></FONT
></TD
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>
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