No mail flow after external IP change

31 Jan 2009 3:04 AM

circulent

This afternoon we changed ISP's, and I reconfigured our network with new
external IP addresses. I updated the firewall's port forwarding of a new
external IP to ports 25 and 443 to our standalone Exchange 2007 server's
internal static IP, yet we cannot send or receive mail. I did update our DNS
forwarding addresses to the DNS servers of the new ISP (Inetrnet access is
fine). Also, I can successfuly access OWA.

What am I missing? Thanks

31 Jan 2009 9:10 PM

Jeremiah

Ptr record for reverse lookups?

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"circulent" <circul***@discussions.microsoft.com> wrote in message
news:988F065D-D901-4E4A-903C-58659B1D442A@microsoft.com...
> This afternoon we changed ISP's, and I reconfigured our network with new
> external IP addresses. I updated the firewall's port forwarding of a new
> external IP to ports 25 and 443 to our standalone Exchange 2007 server's
> internal static IP, yet we cannot send or receive mail. I did update our
> DNS
> forwarding addresses to the DNS servers of the new ISP (Inetrnet access is
> fine). Also, I can successfuly access OWA.
>
> What am I missing? Thanks
>

2 Feb 2009 5:31 AM

Venger

circulent wrote:

> This afternoon we changed ISP's, and I reconfigured our network with new
> external IP addresses. I updated the firewall's port forwarding of a new
> external IP to ports 25 and 443 to our standalone Exchange 2007 server's
> internal static IP, yet we cannot send or receive mail. I did update our DNS
> forwarding addresses to the DNS servers of the new ISP (Inetrnet access is
> fine). Also, I can successfuly access OWA.
>
> What am I missing? Thanks
>

So, you changed your MX record to the new IP address? Or you just
changed your authoritative name servers? The latter doesn't ensure anything.

Can you telnet to port 25 on your public MX IP from outside and get a
220 response from your server? If not, that's why no email is flowing.
If you can, you probably have DNS misconfigured. Make sure your MX host
resolves properly to your new IP address. And make sure you are using
the right one.

If this is confusing, you can tell us the domain name and troubleshoot
from the outside in...

3 Feb 2009 11:58 AM

Oliver Moazzezi [MVP]

Hi there,

You need to ensure your MX information is updated correctly. That means
updating the IP for the ANAME record your MX is based on.

If using a third party for mail hygene, you need to inform them your IP has
changed if they deliver directly via IP.

As for sending, check to see if you use a smarthost to send out - maybe they
are blocking you now you're external IP has changed..

More information would be great - example of the NDR when sending and also
your domain name so we can verify MX records.

Oliver

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