Undeliverable message

I have problem when I'm sending mails to some recipients outside my organization, recieving mail message from my exchange saying that :
Delivery has failed to these recipients or distribution lists:

UserMail@Domain.com
An error occurred while trying to deliver this message to the recipient's e-mail address. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message, or provide the following diagnostic text to your system administrator.

The following organization rejected your message: Postini.
what is the probme exactly.
I sent mail to my domain from x.com domain for test and I'm allready receiving it But when I'm going to reply from Y.com domain to x.com domain again I recieve the error message above.
PS-SupportAsked:
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slinkygnPresidentCommented:
That's insufficient information to answer.

After the "this organization rejected your message" line, there should be "diagnostic information for administrators" IIRC.  That will tell you specifically why the message failed.

That being said, the two most common reasons IMHO are a user not existing and improper relay settings.
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PS-SupportAuthor Commented:
Sorry Slinkygn, I sent you the rest of the message:
Delivery has failed to these recipients or distribution lists:

mahmoud.soliman@gbrands.com
An error occurred while trying to deliver this message to the recipient's e-mail address. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message, or provide the following diagnostic text to your system administrator.

The following organization rejected your message: Postini.

  _____  

Sent by Microsoft Exchange Server 2007







Diagnostic information for administrators:

Generating server: Mail-HUB.BERZIGROUP.LOCAL

mahmoud.soliman@gbrands.com
Postini #550 No such user - psmtp ##

Original message headers:

Received: from MahmoudPC (192.168.0.173) by Mail-HUB.BERZIGROUP.LOCAL
 (192.168.0.110) with Microsoft SMTP Server (TLS) id 8.1.291.1; Sun, 26 Oct
 2008 16:01:12 +0200
Message-ID: <61C4D1AE00264DBAA467A02284365537@BERZIGROUP.LOCAL>
From: Mahmoud Soliman <mahmoud.soliman@edita.com.eg>
To: <mahmoud.soliman@gbrands.com>
Subject: Test from edita
Date: Sun, 26 Oct 2008 16:00:37 +0200
MIME-Version: 1.0
Content-Type: multipart/alternative;
      boundary="----=_NextPart_000_022E_01C93783.FCC8A0A0"
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Windows Mail 6.0.6000.16386
X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6000.16386
Return-Path: mahmoud.soliman@edita.com.eg

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slinkygnPresidentCommented:

mahmoud.soliman@gbrands.com
Postini #550 No such user - psmtp ##

That's your problem.  According to the server that handles mail for gbrands.com, that user doesn't exist.
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PS-SupportAuthor Commented:
Slinkygn. I'm allready have two mail accounts on both comapnies
first : mahmoud.soliman@edita.com.eg
second: mahmoud.soliman@gbrands.com
Both I'm recieving mails from anyone and sending too. But I can send from gbrands.com domain to edita.com.eg domain BUT cant send from edita.com.eg to gbrands.com and recieve the error I sent you before.
WHAT"S THE REAL PROBLEM ???
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slinkygnPresidentCommented:
You said you have trouble sending to *some* outgoing addresses, right?  So your outbound email server seems to be set up correctly.

The real problem is, again, that the gbrands.com mail server -- which is the authority here -- says that the account mahmoud.soliman@gbrands.com doesn't exist.

It doesn't matter if you can send from it.  SMTP servers will take any properly constructed email address as a From: address.  That doesn't tell me the account is set up to receive email, or even that it actually exists.  That's how pranksters can spoof emails from president@whitehouse.gov if they want.

The mail server is clear in the error it returns when it says "no such user."  mahmoud.soliman@gbrands.com is not a valid recipient email.
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slinkygnPresidentCommented:
And here is further proof.  This is from an email account of mine.

--------

This is an automatically generated Delivery Status Notification

Delivery to the following recipient failed permanently:

     mahmoud.soliman@gbrands.com

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 No such user - psmtp (state 14).

   ----- Original message -----

Received: by 10.214.113.15 with SMTP id l15mr4324839qac.54.1225104704617;
        Mon, 27 Oct 2008 03:51:44 -0700 (PDT)
Return-Path: <slinkygn@gmail.com>
Received: from xxxxxxxx
        by mx.google.com with ESMTPS id 33sm4422788yxr.3.2008.10.27.03.51.43
        (version=TLSv1/SSLv3 cipher=RC4-MD5);
        Mon, 27 Oct 2008 03:51:43 -0700 (PDT)
Message-ID: <49059D3E.8030205@gmail.com>
Date: Mon, 27 Oct 2008 05:51:42 -0500
From: George <slinkygn@gmail.com>
User-Agent: Thunderbird 2.0.0.17 (Windows/20080914)
MIME-Version: 1.0
To: mahmoud.soliman@gbrands.com
Subject: testing for experts exchange question
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

test


   ----- End of message -----

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PS-SupportAuthor Commented:
Thanks slinkygn your right its related to the mahmoud.soliman@gbrands.com domain account.
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slinkygnPresidentCommented:
Glad I could help.
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