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The RFC's require that every domain have a email@example.com and firstname.lastname@example.org. Whenever I create a new domain I have to go in and manually setup a Alias that points postmaster@ and abuse@ to me as the system administrator.
#1 Since both of these are required they should automatically created when a new domain is added.
#2 Even if I add them as an Alias the domain administrator can change or delete them.
I would like both postmaster@ and abuse@ created when adding a domain and pointed to the system administrator... and could not be edited by the domain admin. If the system admin wants the domain admin to receive a copy of any messages sent to those addresses the system admin could easily set up a content filter to do so.