mail problem

[Nobody's Hero]

I've really been trying to fix this issue and cant figure out what the problem is. When I send mail from my unix box, I get this message. I dont have any issues on my other systemss but cant figure out what the diff is:

Any Ideas ??

From MAILER-DAEMON Mon Dec 10 01:00:00 2007
Date: Mon, 10 Dec 2007 01:00:00 -0500 (EST)
From: Mail Delivery Subsystem
To:
MIME-Version: 1.0
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)

This is a MIME-encapsulated message

--lBA600sC014385.1197266400/abc123.ba.aaa.gov

The original message was received at Mon, 10 Dec 2007 01:00:00 -0500 (EST)
from localhost [127.0.0.1]

----- The following addresses had permanent fatal errors -----

(reason: 550 5.0.0 Access denied)

----- Transcript of session follows -----
... while talking to webmail.aaa.gov.:
>>> MAIL From:
<<< 550 5.0.0 Access denied
554 5.0.0 Service unavailable

[Steven Schweda]

> <<< 550 5.0.0 Access denied

Apparently, you're on someone's reject list.
Is the result any different for a different
(non-root) user?

[Nobody's Hero]

I tried to email from root to myself, same thing. This server is within our own network. I dont understand it.

Why do you thhink Im being blocked?

[Steven Schweda]

> I tried to email from root to myself, same
> thing.

Well, you get the 550 after the "MAIL From:",
so I'd not be amazed by the same result if
you send a message _from_ the same _sender_.
What happens if you _send_ a message from a
different (non-root) user?

> Why do you thhink Im being blocked?

Ask the fellow who configured the server
who's doing the rejection.

*** alp-l.antinode.org can't find webmail.aaa.gov: Non-existent host/domain

With the information you've provided, I can't
direct you any better.