How can I set up mail server?

Hi, I have an enterprise 250 and I want to set it up to be a mail server...
I created /etc/resolv.conf with this lines:
domain cfemex.com
nameserver 159.16.10.8
and sendmail is already well configured (well I think that) and when I send a messages like this:
/usr/lib/sendmail -v [email protected]
I got this:
[email protected].. Connecting to excite.com via esmtp...
[email protected].. Host unknown (Name server: excite.com: host not found)
soptec... forward: /home/soptec/.forward.k7sp3+: Group writable directory
soptec... forward: /home/soptec/.forward+: Group writable directory
soptec... forward: /home/soptec/.forward.k7sp3: Group writable directory
soptec... forward: /home/soptec/.forward: Group writable directory
/home/soptec/dead.letter... cannot open /home/soptec/dead.letter: Permission denied
soptec... Connecting to local...
soptec... Sent
Please, could anybody help me?
rick.

A heavily loaded question
First off, are you talking about SMTP? IMAP? POP?
Secondly, what are you trying to achieve, specifically?
Due to the nature of the protocols, SMTP is pretty fault tolerant, and multiple SMTP servers don't, necessarily, need to be aware of each other, so 'clustering' SMTP could be a matter of setting up multiple servers in parallel and just load balancing your traffic across them. Nothing difficult there.
IMAP (and POP, if you use it) are different since they affect the user's mailbox and what they see in their mail client. In the worst case, failing over to a different server could render the user's mail inaccessible. For this reason, in high availability scenarios, the actual mailboxes are usually stored on some shared resource such as a SAN - that way any IMAP server can access the user's mailboxes. Of course, this just moves the failure domain from the mail server to the storage server, but for the most part that's a better-known entity.
At the end of the day you need to balance complexity and availability. It is possible to build highly available systems with virtually no downtime and automatic failover. In many cases, though, tolerating a few minutes (or even hours) of downtime while a crashed server is rebooted/rebuilt is not the end of the world.
You'll need to provide more details of your goals before anyone can be more specific.

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