postfix with SPF (Sender Policy Framework) 1
To prevent faked sender-adresses i recommend to use Sender Policy Framework (see www.openspf.org/Introduction). You can easily add the SPF-Modul from openspf.org to postfix. You need these three perl-modules Mail::SPF Net::DNS::Resolver::Programmable NetAddr::IP After installing the requied modules, get the SPF-modul from here. Extract the archiv and copy postfix-policyd-spf-perl to /usr/lib/postfix kopiert. […]