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Why my mail bounced back?

This is using MS Exchange 2003 server in w2k3 ad domain. Recently, few users told me that they got bounced message whenever trying to send to the recipient with error messages:

    did not reach the following recipient(s):

    user1@abc.com on Thu, 8 Sep 2011 18:31:00 +0800
    You do not have permission to send to this recipient.  For assistance, contact your system administrator.
    <mx1.def.com. #5.7.1 smtp;554 5.7.1 Client host rejected: cannot find your reverse hostname, [x.x.x.x]>

The error message said cannot find my reverse hostname? What can I do to accomplice this reverse hostname?
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MezzutOzil
Asked:
MezzutOzil
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1 Solution
 
JohnBusiness Consultant (Owner)Commented:
You need to talk to your ISP and ask them to put in a Reverse Lookup for you. You cannot do it yourself.

You need your ISP to add a Reverse A record similar to this form:  

Needed PTR: 107.xxx.zzz.yyy.in-addr.arpa -> mailserver name

This will permit receivers to know you are legitimate. You cannot do this yourself.

.... Thinkpads_User
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notacomputergeekCommented:
Go to www.dnsgoodies.com and type in your mail server (e.g. mail.contoso.com) in the 'Reverse DNS Lookup' to see what it resolves to.

Yes, thinkpads_user is right, this needs to resolve correctly.
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MezzutOzilAuthor Commented:
Hi both,

I can get the correct resolutions.
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JohnBusiness Consultant (Owner)Commented:
The error message says the reverse resolution is not working correctly, so you need to contact your ISP and not rely on any lookup until they give you an answer. It could, of course, be something different, but do contact them.

... Thinkpads_User
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notacomputergeekCommented:
Are you receiving your e-mail directly into Exchange or are you setup so that your e-mail gets delivered to a hosting mail server and you use POP3 from your Exchange to go get it?
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MezzutOzilAuthor Commented:
Outgoing mails send directly out from Exchange server. For incoming mails, they have to go through a mail gateway (using Centos with MailScanner), before reaching the same exchange server...
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notacomputergeekCommented:
Are you hosting Centos so that both servers are behind the same WAN IP?
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PapertripCommented:
What is the fqdn of your sending server?
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JohnBusiness Consultant (Owner)Commented:
Here is a Reverse Lookup for a known working Exchange system behind a Brightmail spam scanner.

Server: 192.168.5.6
 Address: 192.168.5.6#53  <--- This address does not relate to my client.
 
Non-authoritative answer:
 Name: mail1.clientname.com  <--- This is correct for my client.
 Address: xxx.yyy.zzz.107  <--- This is the Brightmail address, not the Exchange Server.

Let us know what you see.

.... Thinkpads_User

 
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PapertripCommented:
If you tell us the FQDN of your sending server(s), we can easily verify if DNS looks ok.
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MezzutOzilAuthor Commented:
mx3.vbh.com.sg
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PapertripCommented:
pod@box:~$ dig mx3.vbh.com.sg +short
119.73.242.126

Open in new window


pod@box:~$ dig -x 119.73.242.126

; <<>> DiG 9.7.0-P1 <<>> -x 119.73.242.126
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 45499
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

Open in new window


Your reverse record for mx3.vbh.com.sg does not exist.  You need to contact whoever handles DNS for your domain and request they add a PTR record for all of your outgoing mail servers.

That will definitely fix the original problem.
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JohnBusiness Consultant (Owner)Commented:
I found the same thing on another look, and that (contact ISP) goes all the way back to my first post.

..... Thinkpads_User
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PapertripCommented:
Well, technically, you were just guessing at the solution during the first post, so you didn't really "find" anything.  I found and posted conclusive evidence of what the actual problem is.


Don't forget you said:
It could, of course, be something different, but do contact them.
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JohnBusiness Consultant (Owner)Commented:
True, but we had no information until the FQDN was posted and then we both found the same thing. There was no other way initially. ... Thinkpads_User
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PapertripCommented:
You are absolutely correct, I never said anything along the lines of your answer not being correct, but it wasn't able to be proven at that time.
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MezzutOzilAuthor Commented:
Hi both,

Thanks for your info. I'll contact ISP for the mx record registration.
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yo_beeDirector of Information TechnologyCommented:
Are you on a Dynamic IP (i.e. Cable ) or do you have a static?
I had this issue back in 2000 when I setup one of my first clients and I was unable to send mail to AOL or Hotmail because I was part of a dynamic pool of addresses.  Most ISP's will not create PTR on the dynamic pool of addresses.

I needed to setup a SMTP Connecter to route all mail through my ISP SMTP Server.  This solved my issue.
If you have a static address you should be able to have a PTR created as ThinkPads_User mentioned.

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MezzutOzilAuthor Commented:
Excellence
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JohnBusiness Consultant (Owner)Commented:
That was a strange answer you accepted. You might have at least split points.
 ... Thinkpads_User
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yo_beeDirector of Information TechnologyCommented:
Maybe it was a setup for point dumping.
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