Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

Troubleshooting
Research
Professional Opinions
Ask a Question
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

troubleshooting Question

Exchange 2007 IP Name Lookup Failed

Avatar of stellaradmin1
stellaradmin1 asked on
ExchangeDNS
1 Comment1 Solution604 ViewsLast Modified:
I have an Exchnge 2007 environment with a Barracuda spam box in front. My inside network domain is not the same as the outside domain. It's been working for ages now, but today we start getting lots of undelivered emails - mostly stuff lined up for aol.com and comcast.net. I have been emailing people all day long and suddenly this afternoon I start getting stuff like this:

gvlscsv1.corporate.vox.net #550 5.7.1 Access denied. IP name lookup failed [199.72.95.39] SRC003 Contact postmaster@nuvox.net ##

Original message headers:

Received: from Exchange2.TSGJAX.COM (10.10.x.x) by Exchange1.TSGJAX.COM
 (10.10.x,x) with Microsoft SMTP Server (TLS) id 8.1.393.1; Mon, 15 Feb 2010
 16:58:12 -0500
Received: from Mail7.TSGJAX.COM ([fe80::9516:4bca:64f:b1db]) by
 Exchange2.TSGJAX.COM ([10.10.x.x]) with mapi; Mon, 15 Feb 2010 16:58:11
 -0500

Now the .39 address is my public IP for my front end (CAS/HT) Exchange1 server and I have a reverse DNS entry for mail.stellar.net set up for that IP.

Any ideas why suddenly stuff's not going through?
ASKER CERTIFIED SOLUTION
Avatar of Alan Hardisty
Commented:
This problem has been solved!
Unlock 1 Answer and 1 Comment.
See Answers