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sendmail and "sender domain must exist" error

List gurus and sendmail magicans,

I'm running an installation of RHL 8 (psyche). Mainly an internal staging server for web development. While I'm not using it as a mail host I have left sendmail running for reasons that are novice at best, but worked until my employer, in a cost saving move, yanked everyones cell phones and replaced them with alpha pagers.

The pager host excepts email, but are very strict about excepting mail from domains that don't exist. While I applaud the pager host supporting SPF or someother anti-spam effort, it has hosed my cron job reporting that I relied on each morning to know that logging updates and other tasks completed.

So, I have tried to configure sendmail since the switch to work, but the problem is that the machine is behind a firewall and has no outside address.

The machine name is psyche.harrisburgpa.gov. Yes, I have internal DNS running but this DNS does not notify our host DNS, it acts only internally as a caching name server and for internal machine lookups (mainly used only by me as our lousy network admin doesn't care for DNS or is afraid of it or ... i don't know.)

So while our network provider has DNS records for things like www and the "harrisburgpa.gov" record is out there for querying, but "psyche" and "mail" are only known internally.

How do I fix this, either on sendmail, DNS, or use sendmail to forward to our real mail host? I'm sure it's documented somewhere, but I'm just not querying the right words or looking for the wrong thing.

Many thanks in advance,

Here's some logging to help:

The original message was received at Thu, 17 Jun 2004 07:03:15 -0400
from psyche []

   ----- The following addresses had permanent fatal errors -----
<717xxxxxxx page metrocall com>
    (reason: 501 <analog harrisburgpa gov>... Sender domain must exist)

   ----- Transcript of session follows -----
... while talking to popserver4.metrocall.com.:
>>> MAIL From:<analog harrisburgpa gov> SIZE=810
<<< 501 <analog harrisburgpa gov>... Sender domain must exist
501 5.6.0 Data format error

[analog psyche analog]$ mail -v registrant petmystone com Subject: test test

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