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DNSBLs may return DNS A or TXT records, with the TXT record usually displaying text as part of SMTP error text.
Multiple A records can be returned but must be in the 127.0.0.0/8 range, excluding 127.0.0.1 and 127.0.0.2.
The range can signify individual lists within an aggregated list or multiple smaller data sets.
Return codes for Abusix Mail Intelligence lists are in our documentation here.
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Do you want to remove your IP/domain from one of our blocklists?
Please use our lookup-service and follow the instructions there in order to get that resolved.