Cannot email a certain domain

We used to have abc.com domain, but recently split with them and now they have their own server and separate domain from us. Everything looked to go well, but now we are not able to email them directly. We can reply to emails, but cannot send new emails to that domain. I cannot find anything that might be residual that can or could cause this... any help will be appreciated.
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TechneutAsked:
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dtranceConnect With a Mentor Commented:
Of course, purge the zone record for their domain on your DNS server.

What type of DNS server do you have?  Windows DNS or BIND?
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dtranceCommented:
Do you mean they are still abc.com which your exchange server use to manage?
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TechneutAuthor Commented:
Yes. They branched off onto their own small business server. They were completely integrated into our domain till recently. I have removed everything that I can possibly think of and we are still not able to email that company. I believe our domain still believes it is within our domain.
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TechneutAuthor Commented:
Error:
The e-mail address you entered couldn't be found. Check the address and try resending the message. If the problem continues, please contact your helpdesk.

Looks like it is still addressing our internal address book? After I type in an address, it underlines it before sending as if it were in my contacts which it is not.
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dtranceCommented:
From the exchange server, what happens when you do a nslookup on their domain?
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TechneutAuthor Commented:
> mail1.abc.com
Server:  mydomain.com
Address:  192.168.1.1

*** No mail exchange (MX) records available for mail1.abc.com
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dtranceCommented:
Why is your DNS server answering with that local address?
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TechneutAuthor Commented:
I am not sure. We hosted their DNS on our servers, but removed them when the exchanged was moved. Is there any way to fix this?
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TechneutAuthor Commented:
Could I create an A Host record in my domain to point to their exchange IP? Or something manual for now to get emails flowing?
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TechneutAuthor Commented:
Windows DNS. The zone has already been deleted, which is why I don't understand it is still looking at my DNS server for abc.com?
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dtranceCommented:
For the time being, you can setup a conditional forwarder for abc.com.  This is configured on your DNS server.
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TechneutAuthor Commented:
okay added it into our forwarder... now nslookup is timing out?
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TechneutAuthor Commented:
Delivery has failed to these recipients or groups:

Name of User
The e-mail address you entered couldn't be found. Check the address and try resending the message. If the problem continues, please contact your helpdesk.


It errors out when sending an email as well.
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dtranceCommented:
You won't be able to send mail to abc.com until your mail server is able to resolve mail.abc.com correctly.
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