Hello, Thanks, Mark and Sam and Lee, for your replies.
I've just come across this page, http://bind8nt.meiway.com/itsaDNSmess.cfm, which provides clear explanations of several reasons why a mail server sitting behind a NATing firewall without its own public IP address and proper DNS records might fail to send to some domains while successfully sending to many. I can't find a place in Exchange (5.5) where I can tweak what it says in an SMTP session. I have neither the documentation nor the training to be confident, however, that such tweaking is impossible. Does anyone out there know? Otherwise, I will try, as a quick fix, changing the Exchange server's DNS name, that is, its name under the DNS tab of the TCP/IP section of its Network control panel, to the firewall's. I can't think of anyplace else this name gets used on our network... so this shouldn't break anything... I will have a look at postfix, too. Thanks again, Barbara Miller _______________________________________________ Leaf-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/leaf-user
