Hello, I'm running Ubuntu 9.04 on my machines:

When you are using a DNS server on your own network, and a MailServer exim4 on a separate machine, do you also need the DNS Server Machine to have exim4 installed as well to deliver email locally between your other Client PCs?
I figured the DNS machine wouldn't need exim4 installed because it's just for directing where email is to be pointed to via the MX record (which I have pointing to "Machine B", see "My Setup" below..."

My DNS setup appears to be ok when I run the nslookup command on it (it does return that my Ip address and nameserver are authoritave). I'm getting an "email unroutable" on my Client PCs that have exim4 installed on them when I try something like echo "Test email" | exim4 Sam@U2abc.com

The commands dig -x (MyIP 192...) appear to return the reverse zone properly, although i'm not sure about the NXDOMAIN in one of the fields.

Just trying to determine if I just need to setup exim4 on my Mail Server (Machine B).


Here's my setup
Machine A has DNS server (domain name let's say U2abc.com)
Machine B has exim4 server, it is listening to the ip on U2abc.com.
Other Client PCs have exim4 installed on them.

Only the mailserver itself needs exim installed. The mx record in dns should direct mail for the domain to the mailserver. The clients don't need exim, the dns server doesn't need exim.

Hey Thanks. One more question... Would I need to also install dovecot-imapd on the Mail Server Machine where my exim4 is installed?
Thanks.

Unless the users are reading mail on the machine via mutt or something similar then you will need a pop3 / imap daemon of some kind. Dovecot is a good choice as it can provide pop3/s and imap/s.