Sendmail - RH 6.1

I have one machine that runs network monitoring.  When an event occurs, I need the network monitoring software to send an email.  I tried to set up sendmail, but I keep getting errors like "sorry, that domain is not in my list of allowed rcpthosts".  This machine is behind a filewall with NAT, and I just need to get the mail out. Help!?
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ihardingAsked:
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ihardingAuthor Commented:
Edited text of question.
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mnewnhamCommented:
Is it your machine that gives these errors? or the machine that you are trying to deliver to? Can your machine deliver mail locally?
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hwillekensCommented:
Use linuxconf or webmin. Modify your sendmail.cf  to make this machine deliver/accept mail for your domain or your network-ip range
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ihardingAuthor Commented:
The errors are comming from my ISPs machine.
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mnewnhamCommented:
THis error is probably caused because your system does not have a resolvable domain name or address. The ISP is rejecting your connection because of a fear that you are spamming. You would need to reconfigure your system so that your system has a recognizable domain.
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j2Commented:
you probably could fix this by going into linuxconf and set the "masquerade as:" to somehostname.yourisp.com (or whatever)

Newer linuxconfs have changed this option to "present system as"

Thing is that unless your ISP can identify the FQDN that your sendmail is using, it will not accept mail, to avaoid abuse.
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