Internet Protocol (IP) Address Question: Download Questions PDF
What is an IP Block List?
In an attempt to fight spam, several organizations began building black lists in order to ban domain names or IP address ranges that were accursed to be involved in unwanted practices. Many large organizations use these block lists to filter incoming emails. If you notice that some of your emails consistently fail to reach specific recipients and you verified the email address for validity, check if your IP address is blocked and, if so, talk to your provider to rectify the situation. If this happens more than once, get yourself another, better provider.
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