From the National League of Postmasters:
The Postal Service has provided the list of offices that will be upgraded to level 18 under the POStPlan process. Each incumbent Postmaster will receive a letter from the Postal Service informing them of this upgrade. Salary raises will follow current Postal Service policy. Postmasters whose salary is not at the minimum of a level 18 will be slotted in at the minimum of the level 18 pay scale. Postmasters above the minimum salary of the level 18 will receive a 2 percent raise.