reverse DNS lookup failed

news.microsoft.com · Joined: 13 Dec 2007 Posts: 2

Hello everyone.

I do not know that what is happening in my mail server, usually have
Able to send mails to a German domain until yesterday when it started to
Notify the server to send an NDR when that domain German.

I hope you can help me with this problem.

Unable to locate the following recipients:

Name, Name 22/01/2008 15:08

No permission to send to this recipient. Please
Contact your system administrator for assistance.

Configured to reject mail from XXX.XXX.XX.XXX (reverse DNS lookup failed)>

Archived from group: microsoft>public>exchange2000>admin

John Oliver, Jr. [MVP] · Joined: 05 Aug 2007 Posts: 823

Do you have a Reverse PTR Record for your IP?

http://www.intermedia.net/support/kb/default.asp?id=1317

In addition, do you relay your mail through a Smarthost such as your ISP?

--
John Oliver, Jr
MCSE, MCT, CCNA
Exchange MVP 2008
Microsoft Certified Partner

"news.microsoft.com" wrote in message @TK2MSFTNGP02.phx.gbl...
> Hello everyone.
>
>
> I do not know that what is happening in my mail server, usually have Able
> to send mails to a German domain until yesterday when it started to Notify
> the server to send an NDR when that domain German.
>
>
> I hope you can help me with this problem.
>
> Unable to locate the following recipients:
>
>
> Name, Name 22/01/2008 15:08
> No permission to send to this recipient. Please Contact your
> system administrator for assistance.
> > Configured to reject mail from XXX.XXX.XX.XXX (reverse DNS lookup failed)>

DNS issues, reverse lookup, MX records Hello, I've done some searching in the groups, but I'd like to pose a specific scenario. We are getting these errors: #4.7.1 smtp;450 4.7.1 Client host rejected: cannot find your reverse hostname, This is the situation. Our domain name is registered wit

reverse hostname (Windows 2003 server R2 sp2, Exchange system Version 6.5.7638.1) We are having problems with mails being delayed to some recipients. We get: Action: delayed Status: 4.7.1 smtp;450 4.7.1 Client host rejected: cannot find your reverse host

How do I setup NT 4.0 Server - Exchange 5.5 for Reverse DNS We are unable to email certain clients because their mail servers are running reverse DNS and denying our mail. We currently use our ISP's DNS. What do I need to do, step by step, to setup our own DNS with reverse lookup on NT 4? Thanks.

BES GAL lookup We have BlackBerry enterprise servers connecting to Exchange mailboxes in a Microsoft HMC environment. Users in a HMC platform have the CN in the format where the name/ mailbox name is Daniel Noakes. To support multi

Lookup delegate I need to find out if one exchange user is delegator of another exchange user I can use CDO, ADSI. But I can't find any information about it. My second option would be from UI. Just have the first user (delegate) open his/her delegator's