PR_ACCOUNT, PR_ACCOUNT_A, PR_ACCOUNT_W
Contains the recipient's account name.
These properties provide identification and access information for a recipient. They are defined by the recipient and their organization.
These properties commonly contain the recipient's e-mail name, that is, the final component of the e-mail address, which uniquely identifies the recipient in the local organization. The e-mail name corresponds to the X.400 distinguished name, which is meant to be a short name guaranteed to be unique within a certain messaging domain.