open resolver spamhaus

Question

Hello, 
 some Users are unable to send E-mails to us. 
 They are getting 
 
 Remote Server returned '554 5.0.0 <utm.acme.at #5.0.0 smtp; 550 Error: open resolver; https://www.spamhaus.org/returnc/pub/66.185.117.243>' 
 
 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 
 TIA 
 Tibor

dirkkotte · Accepted Answer

seems you can't use spamhaus RBL from public / open DNS-resolvers. 
 Disable the RBL or try a provider-DNS. 
 https://www.spamhaus.org/returnc/pub/66.185.117.243 
 "Queries cannot successfully be made to the Spamhaus free infrastructure via public/open resolvers. This is to protect ...." 
 https://www.spamhaus.com/resource-center/successfully-accessing-spamhauss-free-block-lists-using-a-public-dns/ 
 "FAIR USE PRINCIPLES &ndash; You are not automatically entitled to the use of Spamhaus&rsquo; DNSBL Public Mirrors. Use of the DNSBL Public Mirrors via DNS queries to our public DNSBL servers is free of charge provided you meet all of the following criteria: 
 
 The DNSBL Public Mirror is provided free of charge for non-commercial use by small and medium-sized organizations...." 
 
 "If an IP address regularly exceeds the above criteria, it is suggested the user pays to use the commercial DNSBL Data Query Service (DQS) ."

open resolver spamhaus

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