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Hello @ukender ,
the messages are queued because the email provider is not accepting this much volume. You will have to lower the volume defined in messages per hour for this domain.
You can read more about this here: Key points when managing deliverability in Adobe Campaign Classic
Also, If you are using the enhanced MTA then these MX rules won't work as these are managed by the MTA itself depending on your historic data.
More information on enhanced MTA is available here: Adobe Campaign Classic Enhanced MTA
Thanks,
Manoj