Hello everyone I am researching how to enable DomainKey and DKIM on Postfix and I have read several articles. At the time I found interesting; enable amavis dkim. According to the following articles is very simple: http://stinebaugh.info/add-dkim-signing-to-your-ispconfig-server-ubuntu-12-04-lts/ http://www.faqforge.com/linux/how-to-enable-dkim-email-signatures-in-amavisd-new-and-ispconfig-3/ The above items do not work, because it is required to have some policies in the postfix and amavis to clearly identify the mails leave the server as described in the following article: http://blog.schaal-24.de/ispconfig/ispconfig-dkim-patch/?lang=en Changes are strong and I do not want to damage my production environments. I have read about opendkim and dk-filter and I think they are less intrusive in the server configuration; because only four lines are implemented in the main.cf file to configure the milter behavior. My question is: Does anyone has implemented opendkim and dk-filter jointly with amavis and ispconfig?