certain domains bounce back email- mx changed over weekend

we changed our ISP, which changed MX record. email is sending fine with the exception of twc, aol and windstream...those emails get undeliverables. Using Exchange 2010 and outlook 2010
350ztnAsked:
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Simon Butler (Sembee)ConsultantCommented:
And what does the NDR say?
If you changed the ISP at the weekend I would expect all caching to be flushed now.

Use this tool to identify if the internet is seeing the correct MX record across the world:
https://www.whatsmydns.net/

A trick I have used in the past is to create a new A record and MX record, pointing to the same IP address. That can kick things in to life.

Simon.
350ztnAuthor Commented:
it looks like that is all setup? screen shots attached
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Simon Butler (Sembee)ConsultantCommented:
That is looking at the ISP's systems.
There is no guarantee that is what the world sees, which is why you need to check with public tools and also provide the content of the NDR.

Simon.
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350ztnAuthor Commented:
Attached is pic of error
350ztnAuthor Commented:
picture of NDR. public tools are reflecting the right ip address. A record shows new ip address, and mx shows mail.domainname.us
IMG-5946--1-.JPG
Simon Butler (Sembee)ConsultantCommented:
I misunderstood - I thought this was inbound email, but it is outbound.

Have you looked at the URL specified in the NDR?
It explains exactly what the problem is. You don't have a PTR record on your external IP address, or if you do it isn't configured correctly.

AOL are very picky about senders have a PTR set correctly.
You need to speak to your new ISP. They need to set the PTR on your external IP address that matches the A record.

Simon.

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350ztnAuthor Commented:
Our ISP or godaddy who is used to manage all the DNS records
Simon Butler (Sembee)ConsultantCommented:
ISP. The PTR is set on the IP address. It doesn't matter who your domain is hosted with.

Simon.
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