Weird set of letters )) I don't have such set in our config files.
Postfix sends letters to outer world only from ip-addresses mentioned in mynetworks directive. Otherwise you could use SSL and so on.
Next idea is NAT and masquerading. You could aggregate ip-addresses used by your clients and NAT that addressses to one or more address ))) This procedure hides real network from outer world.
By the way. What problem do you want to resolve ?)
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With best regards,
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