Disk URL Hash Blocklist

A DISK URL blocklist lists Online file storage URLs observed in the message body of spam sent to our primary traps.

This list compliments our domain blocklist since file storage services like Google Drive and Yandex Disk have become a common way for spam to avoid IP and domain blacklisting by hiding behind these services.

Additionally, these services are usually very poor at handling abuse of their services. Since it is not possible to represent a full URL in a DNS query and thus a DNSBL, URLs are first normalized, then SHA-1 hashed. The hash value is then used for lookup instead of the URL.

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