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What you see when your domain has this problem
Added to DULRU Details area Ignore

More Information About Dulru

Dial-up User List is a database for the dial-up users IP addresses. Addresses are provided by ISPs. The purpose of maintaining such a database is to provide technical possibility to recognize e-mail sent directly by dial-up users (thus by-passing ISPs mail server).

Dulru 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 DULRU can be found at their website: