Am 17.06.19 um 11:32 schrieb Stefan Schmidt:
Hello Andreas, thank you for your reply. The idea would have been to prevent duplicates across mail and mailAlias from being created in the first place, but you are right if OpenLDAP doesn't allow this then using an external script to check if the mail addresses are unique could be a workaround.
at least it's not possible using the unique overlay only. Maybe constraints are a way but that's something I'm not familiar with.
Andreas