Our agency is not receiving any email except for those within our agency (intranet) after I made some changes to correct some issues that were being logged in our event viewer for several weeks. We had been receiving event IDs 7004 - "this is an SMTP protocol warning log for virtual server ID 1, connection #, The remote host responded to SMTP command - user unknown." Our queues would fill up (in system manager) with email that could not go out from postal.hdhcs.org (That is our external domain name hdhcs.org).
I thought we might be getting used as an open relay, so I took out all relay permissions. Do users in my organization need to relay? I am not sure I understand the concept.
I also set up Intelligent Mail Filtering and set up some filters for senders. I don't remember the exact changes I made, but have changed things back now to: Message Delivery - General - IP address for server handling incoming SMTP - I entered out internal IP address of email server. I now have no sender filtering configured now and my Intelligent Message filtering is set up for 8 - block messages setting.
My default SMTP virtual server properties is set up for the default virtual server which is the internal address of our email server. I now have it set up for anonymous access. Submit permission - authenticated users, no relay permissions. I have no connectors set up.
Can you help me figure out why we are no longer receiving email from the outside world?