Reverse DNS does not match SMTP Banner

We have SBS  2003, I just switched our ISP provider.  We can send and receive mail for the most part with the exception of sites like hotmail, yahoo, etc.

 We get the error: you do not have permission to send to this recipient.  For assistance, contact your system administrator.
            <mail.domain.com #5.7.1 smtp;550 5.7.1 <recipient@msn.com>... Relaying denied. Proper authentication required.>

For example, we have our setup up is like this:

 FQDN setup as: mail.domain.com
 MX record is: mail.domain.com pointing to 12.12.12.12
 PRT is: 12.12.12.12 pointing to mail.domain.com

When i test domain.com on the mxtoolbox site, I get this:   SMTP Reverse DNS Mismatch       Warning - Reverse DNS does not match SMTP Banner.

Obviously 12.12.12.12 is the new IP address I had changed.  What else am I missing here that I am getting the relaying errors?
MikejettAsked:
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Nathan PSystems ArchitectCommented:
Contact your new ISP, have them set up a Reverse DNS for your new IP address that matches the service you are listing.. in your example mail.domain.com

They own the IP space, so you have to go through them, but they need to be telling the internet that to their knowledge, mail.domain.com exists there, so that you are trusted enough to send mail out of there.

I hope this helps.
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Nick RhodeIT DirectorCommented:
As LectricX posted, contact you ISP and advise them to update their records.  It can take up to 24hrs for it to be updated completely.
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MikejettAuthor Commented:
If my  A record is  mydomain.com and the PRT record is mail.mydomain.com.

Is the prefex here the issue?
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Nathan PSystems ArchitectCommented:
No.  Your DNS servers have no control at all over REVERSE DNS listings.

It's like this..   DNS is you giving out your business card to people you meet.   You get to advertise your name and number (url and IP address) to whomever asks...

Reverse DNS is like the phone company publishing your telephone number in the phone book.  YOU have no control over what they publish, and you cant change it, but you can call the phone company and ask them to change it for you.. right?

Reverse DNS changes MUST go through the owner of the IP address space, and as mentioned before, this is likely your new ISP.
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MikejettAuthor Commented:
Thanks,
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