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blacklist DNSBL servers - incorrect blocked sender's IP address


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An user configured “Request a Delivery Receipt” and “Request a Read Receipt” in Outlook. But sometimes he got an answer about confirmation of reading is marked as Blacklisted according DNSBL list. But if I check sender’s IP address - it is not in blacklist on these DNSBL servers. For example IP address: 136.143.191.44

 

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