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At some point in the past I had to rename the main serverdomain which included several manual changes in config files but I would be surprised if that's the issue since the problem domains are virtual (client) domains.
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Thats mots likely the reason for the problem, as domain definitions in postfix or system config files override virtual domain settings in postfix. So if you missed to change the domain in a single palce, then the local postfix instance will behave as authoritive server for that domain. Have you checked /etc/hosts as well?