Emails blocked by gmxnet

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vensim
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All our emails to the @web.de and @gmx.* are being bounced back.

I received the following from gmxnet,

Your email has been rejected because of one of the following issues related to your mail server configuration:

- no domain name is assigned to your server's IP in the DNS (domain name system)
- your DNS Records point to a list of dynamic IP addresses or to your provider's default entries
- the DNS record that you are using is not accepted by us.

Any ideas what can be done?
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Arn
Hello Vensim, Sorry to hear that you're having problems with mail. We would need a full copy of the bounce-back message to see why the mail is being bounced. Please provide a copy of that message and the email address involved so that we can look into it further. You can also send in a verifiedticket in order to have the issue investigated privately. If you have any further questions or comments, please let us know. Regards, Arnel C.