/MTA=mta-id
Specifies the MTA to connect to when PMDF-X400 is configured for
more than one remote MTA. This qualifier is only applicable when
PMDF-X400 has been configured to support more than one remote
MTA. The mta-id value must be an MTA identification as defined in
the X400-MTAID database. Note that in a single MTA configuration,
as generated by the PMDF CONFIGURE X400 utility, there is no MTA
identification nor X400-MTAID database.