Appologizing up front, because I'm not a Linux server admin... AT ALL..., but I'm trying!

I've installed xampp on my Red Hat server, and as far as I can tell, my sendmail is setup. I'm able to send mail internally on the server; however, that isn't what I really want to be able to do.

I understand that sendmail is a mail engine that will distribute emails, but what I want to be able to do is configure my server to connect to my domain server and route emails through there.

In other words, I have a domain name registered by FXDomains, and with that I have email accounts established. I've got an eCommerce server running on my Red Hat Server so that when someone uses my domain name, it takes you right to my eCommerce.

As someone registers or anything happens on that eCommerce server, i'd like for the email to be sent from the eCommerce server to the appropriate location, but if replied to, it would go to an account that is on my FX Domain. right now, it wont even send an email out...

Any help would be greatly appreciated!

Okay you kind of lost me with the FXDomains and the eCommerce and the "appropriate location"... sounded to me like it's all the same server but apparently not.

ANYway.. to get sendmail to connect to my domain server and route emails through there you need to identify your smart relay host in your sendmail.cf file. In RedHat, this is in /etc/mail/sendmail.cf

or, if you want to identify it by IP:
Save the sendmail.cf file and restart sendmail:
This will work as long as the remote host (your domain server) is configured to accept SMTP traffic from you and relay it.

Send a couple of emails after making the above change and then run "mailq". If there are some messages in the queue, wait about 10 minutes and run "mailq" again. If there's an asterisk beside the ID number they're being processed. When the asterisk goes away, if the message is still in your mail queue, there's a problem. Check your mail log (/var/log/maillog) for hints about what is going wrong.
or

thanks for replying back... this was very helpful.

I think what I am finding is that my outgoing mail from my server is going to my Domain Server that is managed by an outside company. this outgoing mail relay requires a login and password configuration. Is this something that I need to include in that same mail configuration?

Thanks

If they require a login and password then yes you'll have to configure that. Do a search for "SMTP auth" or "SMTP authentication" and you'll find what you need.