DKIM - enable in EXIM

We can use DKIMProxy to achieve this. DKIMproxy is written in Perl. Some of the perl modules needed for proper working of DKIM. We can use "Cpan" to install the necessary modules.

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cpan install Crypt::OpenSSL::RSA
cpan install Digest::SHA
cpan install Mail::Address
cpan install MIME::Base64
cpan install Net::DNS
cpan install Net::Server
cpan install Error
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Download and install the Mail::DKIM module:

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wget http://search.cpan.org/CPAN/authors/id/J/JA/JASLONG/Mail-DKIM-0.39.tar.gz
tar -zxvf Mail-DKIM-0.39.tar.gz
cd Mail-DKIM-0.39
perl Makefile.PL
make
make test
make install
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Download and install DKIMProxy:

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wget http://downloads.sourceforge.net/project/dkimproxy/dkimproxy/1.4.1/dkimproxy-1.4.1.tar.gz
tar -zxvf dkimproxy-1.4.1.tar.gz
cd dkimproxy-1.4.1
./configure --prefix=/usr/local/dkimproxy
make install
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Then we will need to add the following dkim user to the server.

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useradd -M dkim
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Create a startup/shutdown script for the filter. A sample script (sample-dkim-init-script.sh) is provided... make sure to check, and modify if necessary, the user, group, and directory found in the script. Also, you may need to adjust command-line arguments for starting the filter(s). Then you can copy it to /etc/init.d/dkimproxy and use it like any other init script.

cp sample-dkim-init-script.sh /etc/init.d/dkimproxy