When the De-Duplication Filter processes an email, it applies a SHA-256 cryptographic hash function to a set of MAPI properties from the email. From this, it generates a string that represents a digital fingerprint of that e‑mail. In De-Duplication terms, this fingerprint is the unique ID, which is stored in the De‑Duplication database.
Each time an email is processed, the De-Duplication Filter compares the unique ID with those already stored in the De-Duplication database. If these differ, the email is stored in the database; if they are the same, the email is deleted as a duplicate and the De‑Duplication Filter is informed.
Each MAPI property used to generate the unique ID must be defined in the following registry key:
HKEY_LOCAL_MACHINE\Software\ComputerAssociates\CA DataMinder \CurrentVersion\SEV_Deduplication\UniqueIDPropListExch
Within this registry key, you can define the message properties that will uniquely identify the email.
Type: REG_SZ
Data: This value specifies a comma-separated list of MAPI properties used to generate a unique ID for each email processed. For normal use, we recommend you use the default configuration values of:
InternetMessageID, ClientSubmitTime
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