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→Required Package for checking SPF in Postfix
* Postfix installed and configure for your domain
= Required Package Packages for checking SPF in Postfix =
* pypolicyd-spf (from the epel repository, if epel is not enable on your CentOS 7.0 system, you need to run "yum install epel-release" to install it.)
* pypolicyd-spf depends on python-pydns, python-pyspf, and python-ipaddr packages. All three python modules be installed if you use yum to install pypolicyd-spf.