I've just caught the back end of this thread having spent a few days out of the office and also doing exactly what the OP was doing - moving a mail server (or three!) to a 'one instance' setup of Postfix with MailScanner - I wish I'd seen the messages beforehand as it would have saved me some time - I spent a short while scratching my head wondering why incoming mail was now disappearing before realising it wasn't even being fetched - it's a good idea to re-enable postfix's SMTP servicing!! I just dropped in to add that with the latest version of MailScanner (4.40.11) I was getting a warning in maillog that unrar wasn't installed and so rar-compressed archives obviously weren't being checked - fortunately, 'yum install unrar' picked it up from Dag's repository so here's a note for Johnny to add it to the Step 1, (Option 1) yum install command in the section about installing Spamassassin and ClamAV and to put a note about installing it if you're not using Dag.