error 527 outllook

Everytime we want to send an email to this address from the FLExch server the emails do not go through, we recieved the below unreachable error message 527. We do not have problem with NYEXCH server when sending email to this domain. The email goes well, and client is able to reply. I check with our service provider and the rdns record is fine @ the space.
our emails are format this way in florida   
our emails are format this way in new york

Please help me wiht this. I really appreciate it. Below is the error we get in the Florida office:
Sent: Tuesday, June 24, 2008 5:01 PM
To: Daniela Solivan
Subject: Returned mail: unreachable recipients:<email removed>
The original message was received at Tue Jun 24 17:01:23 2008

Likely reason for failure: 527 (
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karwakConnect With a Mentor Commented:
Sorry, too busy today ;-)...

I meant your A record for '' is wrong! It resolves to the wrong ip-address!

Sorry again...
Is your Fl-Exch directly sending out? Have you double checked the ip address it is coming in with at the recipients server?

You could try to simulate a SMTP session with the telnet command from the exchange server. There you can more exactly see the messages of the recipients server. Capture your telnet session and post the output here... (e.g. with Hyperterminal)

Some more details on testing smtp connections can be found here:
FaustinoeltinoAuthor Commented:
this is what i found when i enter our ip (i just changed a few number) on  However, our format is could it be a problem if we have name on the space but, i do not think so because it is only with this domain . Please let me know what you think and thanks for your help. bu query was :
Reverse DNS lookup for is

Warning: Supplied argument is not a valid MySQL result resource in /var/www/html/lookup/index.php3 on line 151 IS NOT directly held within the database
We directly import and use, several external sources of well maintained data.
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Sorry for the delay, what do you exactly mean with "we have name on the space"?

Have you tried to access the recipients server with telnet for further testing?
FaustinoeltinoAuthor Commented:
I tried but things did not work when i use those commands. Is this should be done from the exchange box?
I send an email to the IT guys @ kiwitours. and I explained them that this is only a problem when i have the Florida office sending out emails to them. This is what they reply to me. Below is our orginal IP. Just be careful. He is talking about creating an A records, so this must be done in DNS correct? Please help me if this is correct. Thanks.
Dear Fausto,
I have contacted our Internet Provider and he sent me following message.
It's in german but I hope you have somebody who can translate it.
I think the important message is this:
Make changes in your mailsystem:
Change the name to "" and the IP in
A-Records in
Sorry my english is not so good, but i hope you understand it.
Correct, you should test on / from the Exchange box itself.

OK, I'm a little confused of what you said...., however I try to compile the information I read in my mind. In the meanwhile I will check some things on DNS lookup:

a.) Trying to resolve the PTR-record of the ip-address gives me the host name ''
b.) Trying to resolve the A-record of the host name '' gives me the ip-address of 65.218.x.x

And here we go!!! Reverse-lookup must be the same as the forward-lookup. Which is not the fact for your ''. Many more recipient-systems are checking this due to the increasing amount of spam. I assume is blocking anything that has a incorrect DNS check.

So you should confirm that the A and PTR record for the host '' is correct.

c.) Trying to resolve the PTR-record of the ip-address 65.218.x.x gives my the host name ''

The question now is (as it was before): which ip-address is used by '' when talking to the internet? This one must be consistent in the DNS records. Otherwise no chance...
OK, I also tried to see how your NY office looks like:

d.) Trying to resolve the MX-record of the domain '' gives me the host name ''
e.) Trying to resolve the A-record of the host name '' gives me the ip-address of 65.220.x.x
f.) Trying to resolve the PTR-record of the ip-address 65.220.x.x gives me the host name ''
FaustinoeltinoAuthor Commented:
This is what my service prodiver told me.

Reverse DNS for this IP is set up as follows:
If this needs to change, let us know.

So to change the A and PRT records must be done in DNS Server correct?
Yes, you're right. It's a DNS issue that has to be change on the DNS servers of your provider. You have to ask your provider to set the records according to the real address you are using. (I assume you're using uunet)

So, if your host '' uses the internet address of, both A and PTR record have to point to this ip-address and name! Which means that your current PTR record for '' is wrong!
FaustinoeltinoAuthor Commented:
DNS issue.
FaustinoeltinoAuthor Commented:
A record need to be change. I contact our service provider for this change. Excellent answer. Thanks a lot,
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