Solved

Exchange says cannot deliver message because IP is blocked

Posted on 2008-10-09
5
277 Views
Last Modified: 2013-11-30
I recently installed a new SBS 2003 R2 server at my company about 3 weeks ago.  Everything has been fine but today a user told me all emails to a particular user were being rejected with the error that is attached.  Does this mean my company's public IP has been blacklisted, is it a permissions issue, is it on AT&T's end, my ISP's end?  A little light would be helpful.  THanks!
FROM : System Administrator
SUBJECT :  Undeliverable:FW: TOMRI rent to TREHC
 
BODY OF MESSAGE (has been edited for privacy):
 
Your message did not reach some or all of the intended recipients.
 
Subject:	FW: TOMRI rent to TREHC
Sent:	10/9/2008 11:01 AM
 
The following recipient(s) could not be reached:
 
  XXXX@sbcglobal.net on 10/9/2008 11:01 AM
  The message cannot be delivered due to a configuration error on the server. Please contact your Administrator.
  <XXXX.com #5.3.0 smtp;553 5.3.0 flpi127 - m99H1wgD009159, DNSBL:521< MY.PUBLIC.IP.ADDRESS >_is_blocked.__For_information_see_http://att.net/blocks>

Open in new window

0
Comment
Question by:jasdak
5 Comments
 
LVL 2

Expert Comment

by:Dan560
ID: 22681225
do you have reverse dns? check if you server has been blacklisted here
http://www.mxtoolbox.com/blacklists.aspx
0
 
LVL 33

Assisted Solution

by:Exchange_Geek
Exchange_Geek earned 200 total points
ID: 22681753
0
 
LVL 11

Accepted Solution

by:
Bertling earned 300 total points
ID: 22685761
hi there, you need to create a reverse DNS entry in your external DNS also make sure the FQDn on the SMTP virtual server is the name of the external mailserver A record.

see this and make sure you have done every thing: http://www.amset.info/exchange/dnsconfig.asp

also do you have a static IP address?
0
 

Author Comment

by:jasdak
ID: 22695166
i will check that and be back with you. thank you
0
 
LVL 33

Expert Comment

by:Exchange_Geek
ID: 22696596
Sure, we are all waiting to hear from you.
0

Featured Post

Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

MS Outlook is a world-class email client application that is mainly used for e-communication globally.  In this article, we will discuss the basic idea about MS Outlook, its advanced features, and types of MS Outlook File formats.
Find out what you should include to make the best professional email signature for your organization.
To add imagery to an HTML email signature, you have two options available to you. You can either add a logo/image by embedding it directly into the signature or hosting it externally and linking to it. The vast majority of email clients display l…
This video discusses moving either the default database or any database to a new volume.

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question