I have a problem with my Debian server running ISPConfig 3. I've installed the server a couple of years ago using the perfect server HOWTO: https://www.howtoforge.com/tutorial...8-4-jessie-apache-bind-dovecot-ispconfig-3-1/ I've checked many times and the server isn't an open relay. I'm also using DKIM, spf and registered each domain with Google Postmaster Tools. Still Gmail and Outlook flag many mails as spam. It seems my server has "bad reputation". But there are no newsletters sent from the server, just "regular" correspondence. There also seems to be some spam that comes to my personal inbox that is has a counterfeit address with my domain as a sender. Is there something I can do about that?