UNIX for Dummies Questions & Answers

Hi,

How would I route all out going e-mails from a UNIX server to another e-mail server (an Exchange server) so that the e-mail is actually sent out of the network using the Exchange server instead of the UNIX server?

Sorry, I know I'm being very general with this question.

Thanks!

You might need to see your network admins to get an MX record set up for your exchange server for your domain (if it's the main mail server for your domain).

If you're using local files on your system for hostnames, you could make an entry in /etc/hosts and give it an alias calling it mailhost.

Thanks for your reply!

Basically, here is my situation.

We already have an registered MX record for our Exchange server. No problems exist sending and receiving mails with the Exchange server.

Recently, we had to implement a UNIX server with support to our SAP application. When transactions are made with the SAP application, it sends out an e-mail confirmation to the client. This is all well and fine, except that some of our client's mail servers are rejecting e-mails coming from this UNIX server because it does not have a registered MX record on the internet. The solution that I've come up with is to route all the mails sending out from the UNIX server to our working Exchange server so that our client's mail server would accept the mails.

Here's a solution that I've found. But will this mask just the text level or the MX record level? If it's the MX record level, then I guess my problem is solved. Can someone confirm if this will solve my problem?

Thanks,

"Using the m4 macros, use:

MASQUERADE_AS(my.dom.ain)

This will cause all addresses to be sent out as being from the
indicated domain.

On your mailhub/mailhost/Domain Mail eXchanger, you may need to
add "my.dom.ain" to the sendmail.cw file or the "Cwhost.my.dom.ain"
line in the sendmail.cf file.

If you're using version 8.7 sendmail, and you want to hide this
information in the envelope as well as the headers, use:

FEATURE(masquerade_envelope)"

I have never seen an MTA reject a message because the sending MTA did not have an MX record. MX records are generally used for sending mail, not receiving. Also, if a MX record is not used, the sending host will attempt the A record.

You may have a different problem. What is the output of trying to send mail from the UNIX box to a 'rejecting host' with the sendmail -v comand line to send a test message?