6. An article of manufacture including a computer readable medium having instructions stored thereon that, in response to execution by a computing device, cause the computing device to perform operations, comprising: a processor on the computing device identifying traceability or association information associated with a domain in an assessment request, wherein the traceability or association information indicates an amount of personal information or a qualification level required for obtaining an email address for the domain; deriving a reputability score for the domain according to the identified traceability and association information, wherein the reputability score is higher indicating a higher reputability when more personal information or a higher qualification level is required for obtaining the email address for the domain and the reputability score is lower indicating a lower reputability when less personal information or a lower qualification level is required for obtaining the email address for the domain; determining whether a first domain level in a hierarchical domain matches the domain in the assessment request; using a first reputability value associated with the first domain level for deriving the reputability score when the first domain level matches the domain; determining whether a second sub-domain level of the first domain level in the hierarchical domain matches the domain in the assessment request; and using a second reputability value associated with the second sub-domain level associated with a higher reputability than the first reputability value for deriving the reputability score when the second sub-domain level matches the domain in the assessment request.
6. An article of manufacture including a computer readable medium having instructions stored thereon that, in response to execution by a computing device, cause the computing device to perform operations, comprising: a processor on the computing device identifying traceability or association information associated with a domain in an assessment request, wherein the traceability or association information indicates an amount of personal information or a qualification level required for obtaining an email address for the domain; deriving a reputability score for the domain according to the identified traceability and association information, wherein the reputability score is higher indicating a higher reputability when more personal information or a higher qualification level is required for obtaining the email address for the domain and the reputability score is lower indicating a lower reputability when less personal information or a lower qualification level is required for obtaining the email address for the domain; determining whether a first domain level in a hierarchical domain matches the domain in the assessment request; using a first reputability value associated with the first domain level for deriving the reputability score when the first domain level matches the domain; determining whether a second sub-domain level of the first domain level in the hierarchical domain matches the domain in the assessment request; and using a second reputability value associated with the second sub-domain level associated with a higher reputability than the first reputability value for deriving the reputability score when the second sub-domain level matches the domain in the assessment request. 9. The article of manufacture according to claim 6 wherein: the reputability score derived for the domain is higher when email addresses for the domain are only assigned to members of an organization associated with the domain; and the reputability score derived for the domain is lower when email addresses for the domain are assigned to non-members of the organization associated with the domain.