USPS mail sorters do not make 90K a year. According to this link, the max step for a PS-5 postal worker is $49,851.
http://postalwork.net/pay_scales.htm
Any reason why Residential mail delivery could not be reduced to one day per week?
For myself 75% of my bills are deducted from my bank account or charged to a credit card.
If I only received mail one day per week, that would be fine with me.
And if they made the mail delivery day the same day as garbage collection, I could throw away the junk mail before it ever got inside the house.
To make this plan happen the USPS would give reduced postage rates to residential customers who opted for weekly service. Within months the USPS would have dramatically cut their costs.
The salary is 50K and the benefits are another 35-40K with 4 weeks of vacation. They have some the best retirement and HC benefits on the planet.