Solved

Emails not accepted by bellsouth.net / SMTPDIAG Error 220

Posted on 2008-01-29
3
2,942 Views
Last Modified: 2013-11-30
Emails to bellsouth.net timeout. Worked three weeks ago just fine - can't figure out whats the cause.  I have emailed bellsouth.net to see if they are blocking us.  This is not a firewall issue I'm sure of it.  If I try to telnet I get a 550 Blocked message as though I'm blacklisted.  But I don't appear blacklisted on any of the searches I've done.  Please let me know if there is more information you need.  This is a single domain with a single Exchange 2003 server.

HARDWARE
Windows Server 2003 with Exchange 2003 SP2

TESTS
Checked my llocal DNS server everything is fine.
Contacted my ISP regarding DNS and things look good there.  
Contacted my hosting company and my records look good there MX, A etc...
Checked and our domain isn't on a blacklist and reverse dns is working
Uninstalled Symantec Antivirus that was installed in the meantime in case that was the problem - didn't resolve anything

Ran SMTPDIAG and received the following:
SOA Serial Number Match: Passed
Both TCP and UDP queries succeeded. Local DNS test passed
Both TCP and UDP queries succeeded. Remote DNS test passed
Checking MX Servers listed for person@bellsouth.net
Connecting to gateway-f1.isp.att.net [204.127.217.16] on port 25.
Error: Expected "220".  Server is not accepting connections.
Failed to submit mail to gateway-f1.isp.att.net
Connecting to gateway-f2.ispatt.net [207.115.11.16] on port 25
Error: Expected "220".  Server is not accepting connections.
Failed to submit mail to gateway-f2.isp.att.net
0
Comment
Question by:hazenweber
3 Comments
 

Assisted Solution

by:Michael_Cook
Michael_Cook earned 100 total points
ID: 20839509
I believe ATT (and several others) require you to have a reverse DNS entry  (rDNS)  for your mail server. So they can resolve the IP address back to you.

Speak to your ISP who can create this entry
0
 

Accepted Solution

by:
acc-tech earned 200 total points
ID: 20842422
Use smtpdiag with the /v switch.
0
 
LVL 1

Assisted Solution

by:absremote
absremote earned 100 total points
ID: 20869381
Also looking for help. Several of my clients, who have a properly working DNS system have the same problem. Emails to bellsouth.net are not delivered.
0

Featured Post

Problems using Powershell and Active Directory?

Managing Active Directory does not always have to be complicated.  If you are spending more time trying instead of doing, then it's time to look at something else. For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why

Question has a verified solution.

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

Exchange server is not supported in any cloud-hosted platform (other than Azure with Azure Premium Storage).
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.
In this video we show how to create a Contact 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 >> Contact ta…
In this video we show how to create an Accepted Domain 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 >> Ac…

777 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