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open resolver spamhaus


some Users are unable to send E-mails to us.

They are getting

Remote Server returned '554 5.0.0 < #5.0.0 smtp; 550 Error: open resolver;>'

if I klick on the Link  Spamhaus tells me that the Problem is on the receiving side.

I do'nt know where the IP is from.

I've read the Spamhaus Page but can't figure out what's wrong.

The Count of Emails getting blocked are rising every day and i have to solve the problem.

I've googled the problem but there are no evidences :-(

would be lucky if someone could help



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