I have a RedHat Sendmail server relay internet facing then relays email to our Exchange server. I don't have any fluency in the sendmail server, and only have access to command line. I'm trying to troubleshoot a sender getting bounce backs 4.4.1 errors - but I don't see these messages even reaching the Exchange server, so I'm leaning towards the relay server. I'm not sure of the configuration of it, and would like to review it see if there are any logs that show denys or drops of incoming mail - is this possible? If so, what commands do I enter to view this log? I'm not familiar with any Redhat/Linux command line, so I would need step by step.