I used this guide a week ago. http://www.howtoforge.com/perfect-server-debian-wheezy-apache2-bind-dovecot-ispconfig-3 To setup a server. I'm begining to populate it just now and I'm noticing that mail is not arriving. All the DNS setting are pointed correctly. NSLOOKUP confirms that the domains are now redirected. The MX records are set properly. Yet mail does not get rejected. It just goes into a black hole of sorts. It just never arrives. Is there anything I might check?