ESMTP #550 Cannot relay. Mailbox not available

Hello. I need to figure out why I'm getting the following errors from my SBS 2008 / Exchange 2007 server today. Both messages to the "af.mil" are getting bounced with this error message. Additionally, I have successfully sent test messages to these addresses from another e-mail server.

Diagnostic information for administrators:
 
Generating server: SBSERVER.?????.local
 
?????@?????.af.mil
ESMTP #550 Cannot relay. Mailbox not available ?????@?????.af.mil ##
 
?????@?????.af.mil
ESMTP #550 Cannot relay. Mailbox not available ?????@?????.af.mil ##
 
Original message headers:
 
Received: from SBSERVER.?????.local ([?????]) by
 SBSERVER.?????.local ([?????]) with mapi; Fri,
 31 May 2013 09:13:05 -0700
From: ????? <?????@?????.com>
To: "?????"
        <?????@?????.af.mil>
CC: "?????" <?????@?????.af.mil>,
        ????? <?????@?????.com>, ?????
        <?????@?????.com>
Disposition-Notification-To: ????? <?????@?????.com>
Return-Receipt-To: <?????@?????.com>
Date: Fri, 31 May 2013 09:13:04 -0700
Subject: TO0012 Transformer progress report labeled #11
Thread-Topic: TO0012 Transformer progress report labeled #11
Thread-Index: Ac5eGZYtw5H3o98BSXmFG/jUOnLG9w==
Message-ID: <43F2D0F2E1ACC9439211363B909F81BADBE510D42B@SBSERVER.calpropaint.local>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
acceptlanguage: en-US
Content-Type: multipart/mixed;
        boundary="_004_43F2D0F2E1ACC9439211363B909F81BADBE510D42BSBSERVERcalpr_"
MIME-Version: 1.0

Open in new window


Any ideas?

Thank you in advance!
SkinnerTechAsked:
Who is Participating?
 
Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
Looks to like it is a problem with the recipients server blocking the message for some reason. The fact that your server is in the NDR just means that is the server that generated the NDR, not the server that caused it. I don't think there is anything wrong with your server.

Simon.
0
 
suriyaehnopCommented:
Please provide the details on your Send-Connector
0
 
SkinnerTechAuthor Commented:
It's using the Hub Transport server role:

FQDN = remote.?????.com
Network = Use DNS "MX" records to route mail automatically
[  ] Enable Domain Security (unchecked)
[  ] Use the External DNS Lookup settings on the transport server (unchecked)

Open in new window


Exchange is not my forte, so bear with me. If you need anything else please let me know.
0
Easily manage email signatures in Office 365

Managing email signatures in Office 365 can be a challenging task if you don't have the right tool. CodeTwo Email Signatures for Office 365 will help you implement a unified email signature look, no matter what email client is used by users. Test it for free!

 
suriyaehnopCommented:
How about Address Space tab on "Send Connector"
0
 
SkinnerTechAuthor Commented:
Type = SMTP
Address = *
[ X ] Include all subdomains (checked)
Cost = 1

Open in new window

0
 
mmahaekConnect With a Mentor Commented:
99% of the time I see this error, it turns out to be the recipients spam filter blocking the message.
0
 
Mark GalvinManaging Director / Principal ConsultantCommented:
Hi

What application are you using to send the email that is bouncing back?

The error 'ESMTP #550 Cannot relay. Mailbox not available ?????@?????.af.mil ##
 ' is stating that it cannot relay, which normally is your exchange box telling you that something is trying to use it as an smtp relay which is turned off be default

Just an idea

Thanks
Pappaslim
0
 
Mark GalvinManaging Director / Principal ConsultantCommented:
http://www.gordano.com/kb.htm?q=475
Might help

Thanks
Pappaslim
0
 
SkinnerTechAuthor Commented:
Hey Guys

Thanks for the help. We are using Outlook 2010 from within the domain to send the mail. Also, just to clarify - the problem only exists with these two recipients.

What do you guys think?
0
All Courses

From novice to tech pro — start learning today.