I am not sure if MS ever published an official answer for this, but the
unofficial answer I am aware of is they don't use SMTP for security reasons. RPC
over IP is authenticated and encrypted.
When it really gets down to it though, the reason why is moot. It isn't
available plain and simple. It would have been easier to have had all partitions
be able to use versus specifically put in code to disallow domain partitions
from replicating between domain replicas.
Again the discussion is moot and I haven't seen where MS has officially
published anything.
But at a guess, the GC partitions are not writable. Or to put it better, you may
find a way to write to the GC partitions, but you can't get that to replicate
into a writeable partition on a DC that hosts the domain.
A better question would be, why doesn't it apply to the config and schema
partitions.
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