What you see when your domain has this problem
|Added to SCHULTE||
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More Information About Schulte
This blacklist generally adds /24 or /16 catch all entries when repeated spam comes from a /24 or /16 and they don't foresee any legitimate email coming from these hosts.
Schulte Reports Subnets
Subnet-based Blacklists are used to reject email from entire ranges of IP Addresses, i.e. providers that are hosting companies sending spam, as well as single IP Addresses that may fall in that range of IP Address.
More information about SCHULTE can be found at their website: