A wave of anger is cresting at post offices across the country. Letter carriers are looking at the big raises that other union members have won—38 percent over four years at Boeing, 62 percent in six years at the East Coast ports, $7.50 in five years at UPS. They’re comparing those gains to the tentative agreement their president handed them in October: 1.3 percent a year for three years. “It doesn’t account for everything we went through with Covid,” said Saqia Talbert, a letter carrier in Allentown, Pennsylvania.