Multiple MX records possible? Jim in Cleveland 4/16/2007 4:42:03 AM We are running an Exchange 2000 server inside our firewall. To this point, it is running fine. I also have a UNIX box that I need to send out email notices to customers. I tried pointing the UNIX box to the Exchange server so that I could use it as a relay. We have one MX record that points to an external mail address which then translates it to the internal address of the exchange server. Can I create another MX record just for the UNIX box? Ex. Unix box Exchange server ISA server 192.168.X.2 192.168.x.15 66.xxx.xxx.165 MX records for our domain points to the 66.xxx.xxx.165 address. If the UNIX box also has an exterior address that points to the internal address of hte UNIX box, can I create another MX record and have it pointed to the external address of the UNIX box for email purposes? If so, would that screw up our current mail system?

Re: Multiple MX records possible? "Lanwench [MVP - Exchange]" <lanwench[ at ]heybuddy.donotsendme.unsolicitedmail.atyahoo.com> 4/16/2007 5:14:35 PM Jim in Cleveland <JiminCleveland[ at ]discussions.microsoft.com> wrote: [Quoted Text] > We are running an Exchange 2000 server inside our firewall. To this > point, it is running fine. I also have a UNIX box that I need to > send out email notices to customers. I tried pointing the UNIX box > to the Exchange server so that I could use it as a relay. We have > one MX record that points to an external mail address ? MX records specify A records - which in turn point at public IP addresses. The public IP address is generally NATted/forwarded to the internal mail server IP address - SMTP uses TCP 25, which you probably have forwarded already if you're using the Exchange box to host your domain's mail. > which then > translates it to the internal address of the exchange server. Can I > create another MX record just for the UNIX box? Not necessary at all - > > Ex. > > Unix box Exchange server ISA > server 192.168.X.2 192.168.x.15 > 66.xxx.xxx.165 > > MX records for our domain points to the 66.xxx.xxx.165 address. > If the UNIX box also has an exterior address that points to the > internal address of hte UNIX box, can I create another MX record and > have it pointed to the external address of the UNIX box for email > purposes? If so, would that screw up our current mail system? All you need to is allow this machine to *relay* through your server, so MX records don't apply. MX records exist so that senders who wish to get mail to yourdomain.com know where the mail server(s) for yourdomain.com are. If you want an external *nix box to relay through your exchange server, configure it with the external FQDN of the Exchange server. If this is an *internal* box, specify the internal server name or LAN IP as the SMTP server. If it supports authenticated relay, configure it to authenticate. Exchange 2k & up enable auth relay by default. If it doesn't support authenticated relay, go to the properties of your virtual SMTP server and add the IP address of the Unix box to the "allowed to relay" list (either public or private IP address, as the case may be). You might post future Exchange questions in microsoft.public.exchange.admin - even if you think they may be DNS related.