Postal Rate Commission recommend rates and fees [that] shall provide sufficient revenues so that total estimated income  to the Postal Service will equal as nearly as practicable total estimated costs of [operating] the Postal Service.
The Postal Service does not seek to turn a profit from recommended rates and fees. 
mnli hypothesis: The Postal Service does not seek to turn a profit from recommended rates and fees.  premise: Postal Rate Commission recommend rates and fees [that] shall provide sufficient revenues so that total estimated income  to the Postal Service will equal as nearly as practicable total estimated costs of [operating] the Postal Service.