Hi all, I am stuck! And I mean stuck! Since there isn't really a guide on configuring DKIM and Postfix on Mac itself, (at least not that I have found) I have been following various other guides to setup DKIM signing on a Postfix installation. So here is a summary of the installed packages: Postfix - Vr: 2.5.14 - pastebin.com/gjN12RAE < postconf terminal printout amavisd-new - Vr 2.6.4 (Installed to /user/bin/amavisd) pastebin.com/kGa2RzFY < amavisd-new conf I have 2 issues: When I run the amavisd, it always trys to run as EUI-501 which is the current logged in user. How do I set this as a service to run when Postfix is running under its assign username of "_amavisd" (I current get around this by issuing the following command: sudo -u _amavisd amavisd start) When I attempt to generate a new DKIM key using the command: sudo amavisd genrsa /Library/Server/Mail/Config/amavisd/dkim_key I get the following reply in the terminal: genrsa: Can't create file "/Library/Server/Mail/Config/amavisd/dkim_key": 2 Any help would be great folks, am mostly a Windows man, only get into this Apple stuff with a new role. We will move to newer linux distros with a refresh of the system, but I have a need to maintain the current systems. Thanks