Sometimes you get email messages and sometimes you do not. What is up with that? Is it your modem? Maybe your server does not recognize the incoming email as anything other than spam? Actually, it could just be the fact that your IP address is blacklisted; yes, blacklisted. No one knows quite how their addresses get blacklisted, only that certain networks and databases spot IP addresses that seem to go out and flood inboxes and then you are blacklisted.