List, I am trying to use FC5 for a gateway machine with an external eth0 (XXX.XXX.XXX.XXX) and internal eth1 (10.0.0.135). I am having some difficulty setting up sendmail. I have installed essentially the same sendmail.mc that I have used with an FC4 gateway, but the FC5 system does not appear to be recognizing localhost properly. For instance when I "telnet localhost 25" I connect to sendmail, but when I try to send a command like HELP I get a response "550 5.0.0 Access denied" or when I try to use "mail -v -s 'Test' root" I receive "550 5.0.0 Access denied". Surprisingly, when I telnet 10.0.0.135 25 (from the local machine) I connect to sendmail and am able to manually communicate with sendmail and even send a message. When I "telnet (XXX.XXX.XXX.XXX) 25" (from an external source) I am able to connect to sendmail and send a piece of mail manually. If my sendmail.mc, or host files are faulty I can not find the error. Does anyone know if this is a bug related to FC5, sendmail, and localhost? Greg Ennis