Sendmail Linux question

[cosmoh2o]

Please help,

I have a RedHat 7.X server that sits on my company's DMZ (66.192.236.XXX) and an email server (a Windows 2000 exchange box)that sits inside our LAN. I can call the sendmail program with a PERL script and have it email anyone outside of our LAN but the instant I try and email anyone inside of our LAN, for example an email address of one of our employees on the email server I run into problems. The program executes but the mail is NOT delivered. Root on the Linux server (66.192.236.XXX) gets a mail message saying that the person's email address (me@carsonson.com)does not have an MX record.
I have never had this problem before and was wondering if anyone out there has and if so, how can it be resolved? Thanks to any help.

P.S. The firewall is "wide open" between the Linux server on the DMZ and the Exchange server.

 

[sleipnir214]

Does the domain have an MX record, and can the Linux box find that MX record?

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[cosmoh2o]

Thank you for responding so quickly. The domain has an MX record but the Linux box can not see it.

 

[fluid11]

Why can't it see it? Which name server is the Linux box using? A public or private name server?


ChrisP
RHCE, LPIC-1, CCNA, CNE, MCSE, +10 others

 

[cosmoh2o]

I just read the mail that the sendmail program on the linux box is emailing to root. When I try to email anyone with a username@carsondellosa.com address I get "Unable to find MX record" error. Can I set up a MX record on Linux for anyone with "X@carsondellosa.com" that resolves to the outside address of the exchange server? I appologize if these are stupid questions but I am new to using Linux as a emailing system. Thanks to all for responding.