Microsoft Exchange issue

Sean
Sean used Ask the Experts™
on
Hello,

My Exchange ( we host our own server ) public IP address changed and now some of the emails are getting bounced back, below is one of the examples, is this really a DNS  related issue?


joe@joesresources.com on Wed, 18 Apr 2012 13:23:29 -0700
    You do not have permission to send to this recipient.  For assistance, contact your system administrator.
    <exchange001.mycompany.com #5.7.1 smtp;550 5.7.1 This system is configured to reject mail from 12.238.xx.xx [12.238.xx.xx] (DNS reverse lookup failed)>

Thanks
S
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Alan HardistyCo-Owner
Top Expert 2011
Commented:
As your IP Address has changed, have you asked your ISP to setup Reverse DNS on your new IP Address?

This is an RFC requirement and without it, you will get your emails rejected by some companies using decent Anti-Spam software.

If you haven;t done this, which the NDR suggests, call your ISP asap and get it setup.

The Reverse DNS Record should be something like mail.yourdomain.com as long as mail.yourdomain.com resolves in Public DNS back to your new IP Address.
Commented:
Kind of.  You need to contact your ISP, or whoever gives you your IP and get them to create the reverse lookup for your DNS name.

ISP = IP -> name
DNS = Name > IP

Edit.  Did not see above comment.  He also nailed it.

Author

Commented:
alanhardisty/Unconn,

Thank you both. I wish it was that easy to setup a reverse DNS .

Regards,
S
Alan HardistyCo-Owner
Top Expert 2011

Commented:
It should be.  Is your ISP giving you a hard time?

You need an A record pointing to the IP Address before most ISP's will add Reverse DNS.

Author

Commented:
ISP is ATT and they wont do it unless we host at least one domain name ( Not in a Dead zone ) with them which we dont. They will delegate but the other party wont do /24 subnets only /28.
Co-Owner
Top Expert 2011
Commented:
Then you have a problem.

If they won't do this - either it's time to change ISP's to another, or you may be forced to use a SmartHost to send all your emails out via.

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