Exchange 2010 - Delivery Error

I have an Exchange 2010 SP1 server (SBS 2011).

We try to send to some wanadoo addresses of our customers and we get the following message back: The server has tried to deliver this message, without success, and has stopped trying. Please try sending this message again. If the problem continues, contact your helpdesk.

I have tried to send it from gmail and it works. I get an answer the message received well.

I don't understand why. Can someone help me?

One thing: Last week I removed the forwarders of my DNS (I used the forwarders from google and opendns). The reason for removing was problems on my network. This problems are solved after removing the forwarders.

Maybe this is a part of the problem?  Maybe I need forwarders?

When I have to use forwarders, which forwarders are the best to use? Maybe the forwarders of my ISP?
Program1981Asked:
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Dhiraj MuthaLevel DCommented:
I suspect the issue with your ISP. Please check with them whether the given addresses are blacklisted or blocked from there end. We had the same issue and it was resolved by my ISP.
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Program1981Author Commented:
Thank you for your answer. Maybe thats the problem, the smtp server of wanadoo is blacklisted. I found that on mxtoolbox.com.

I contact my ISP this day about this issue.

Or is this also a good solution: creating a new send connector only for this emailadresses. And send the e-mail with the 'use domain name system DNS MX records to route mail automatically.
At this moment we send all the e-mail with the stmp of our ISP
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Dhiraj MuthaLevel DCommented:
Your second option looks good. You can go for it and test it before you implement it. Because again it will go and hit the ISP I think.
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Program1981Author Commented:
This problem is solved.

The receiver was on a blacklist. I solved it by my own solution.
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Program1981Author Commented:
Problem solved: to make another send connector.
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