The Standard Reputation Services includes a database with the following lists:
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Known Spam Source List: A list of IP addresses of mail servers that are known to be sources of spam.
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Dial-up User List (DUL): A list of dynamically assigned IP addresses, or those with an Acceptable Use Policy (AUP) that prohibits public mail servers. Most entries are maintained in cooperation with the ISP owning the network space. IP addresses in this list should not be sending email directly but should be using the mail servers of their ISP.
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Emerging Threat List (ETL): includes IP addresses of mail servers involved in active ransomware, malware, or other email threat campaigns.
In the the Standard section, you may do the following:
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Enable or disable the lookup of selected lists by using the check boxes.
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Select the check box to enable the list.
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Clear the check box to turn off the list. The Email Reputation Services system skips that list during a lookup request.
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Click the Save button to save new settings.