After the DMARC Records checks in DMARC check on Debian Wheezy, I show how reports can be created and sent. First, we need a mysql database and a user to save the DMARC checks. Invoke mysql and run: CREATE DATABASE opendmarc; CREATE USER ‘opendmarc’@’127.0.0.1’ IDENTFIED BY ‘top_secret’; GRANT ALL PRIVILEGES […]
I use SPF records for many years. My implementation of SPF records in ISPConfig occurred to me to point out the advantages again. SPF is an authentication method that is stored in the DNS. This entry specifies which server can send mail for a particular domain. And why do I […]
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. […]