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No, I was wrong. It's not a restriction, it's probably this bug here, vote on it to give it some weight. Did you actually try creating the domain with zmprov? Try this as the zimbra user:
I guess that you're trying to add it to a distribution list on your server? If you are try the zmprov command to add members to a list (zmprov help commands will get you the syntax or look in the wiki). This is the format: