An email's unique ID is generated from a set of MAPI properties from the email. These properties are encrypted using the SHA-256 algorithm. Each MAPI property used to generate the unique ID must be defined in the registry. A set of these will then be specified for each journal email type. That is, envelope-journaled e‑mails are configured differently to non-envelope-journaled emails.
By default, the Universal Adapter installation sets the MAPI properties that we have found to be the most useful for generating the unique email IDs. Care must be taken to ensure that these properties can uniquely identify an e‑mail and are identical for all duplicates of that email.
The procedure for setting up the unique ID property list is summarized below:
Note: If you change the MAPI properties used to create the unique ID (that is, you reconfigure any of the registry settings in the next section), the Universal Adapter could potentially allocate the same ID to two identical emails, causing duplicate emails to be processed and stored. For this reason, you must restart the UA service for the changes to take effect.
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