Solved

Exchange says cannot deliver message because IP is blocked

Posted on 2008-10-09
5
274 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

What Security Threats Are You Missing?

Enhance your security with threat intelligence from the web. Get trending threat insights on hackers, exploits, and suspicious IP addresses delivered to your inbox with our free Cyber Daily.

Join & Write a Comment

Check out this infographic on what you need to make a good email signature that will work perfectly for your organization.
Disabling the Directory Sync Service Account in Office 365 will stop directory synchronization from working.
In this video we show how to create a Distribution Group in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Recipients >>…
In this video we show how to create an email address policy in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.:  First we need to log into the Exchange Admin Center. Navigate to the Mail Flow…

708 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

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now