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The point of using LDAP is to have a single user object in the database, to which different roles can be assigned. Roles are commonly shared between two or more people in the same organization. For example, the role "Sales Representative" might be assigned to Alice, Bob and Charlie, meaning that each of these three users is also assigned the sales@eample.com email address.
If Alice now decides to go on vacation, mail sent to alice@example.com should be answered with an absentee note. However, mail sent to sales@example.com must not be answered with one, even though that email address is bound to Alice's user object.
Blacklisting email addresses solves exactly this problem. By putting sales@example.com in the blacklist, it is ensured, that this specific email address is never subject to auto replies.