1. Install prerequisites=========== yum install sendmail-devel openssl-devel ===========2. Install OpenDKIM Download then extract OpenDKIM. Change to the extracted directory and run configure, make and then, as root, make install. =========== wget http://downloads.sourceforge.net/project/opendkim/opendkim-2.4.2.tar.gz tar -zxf opendkim-2.4.2.tar.gz cd opendkim* ./configure make && make install =========== 3. Post install steps Create a Linux… Continue Reading Install DKIM in Postfix using openDKIM