Attributes for Exchange 5.5 Mailboxes : Public-Delegates
This is an array of distinguished names which specify the mailboxes (or rather mailbox-owners) that have "Send As" permissions for this mailbox.
|Data type||Distinguished Names of other objects|
|Heuristic||20 => Replicated between sites, no operational attribute|
|Ex55 Database name||Public-Delegates|
Only DN identifiers of objects in the Exchange directory are valid here.
When changing this attribute, the Exchange system will automatically create an according backlink attribute for the particular object that was entered here (in Public-Delegates-BL). So you can check this backlink attribute of your mailbox to check if it is used as an "Send As" permission holder for another mailbox.