How to enable DKIM email signatures in amavisd-new and ISPConfig 3.0

NOTE: This post is about ISPConfig 3.0 and not 3.1 and newer. ISPConfig 3.1 and newer has DKIM support builtin, you can simply enable DKIM in ISPConfig 3.1 GUI now for the mail domain. DKIM is a system to verify the sender and integrity of emails. ISPConfig 3 uses amavisd-new as content filter for spam ... Read more

How to renew SSL certificates for courier pop3 and imap server on Debian or Ubuntu?

This articles describes the renewal of SSL certificates for courier pop3 and imap server. This is nescessary e.g. when the certificates are expired or contain the wrong hostname. First delete the exsiting certificates: rm -f /etc/courier/imapd.pem rm -f /etc/courier/pop3d.pem Then edit the template that contains the details for the ecrtificates so that the hostname in ... Read more