High Paying Post Office Jobs Window Clerk Mail Processing Machine Operator Mail Handler Mail Inserter Mail Processor. Salary range. $27,500-$35,000 per year Mailer. Salary range. $26,000-$34,500 per year Mail Sorter. Salary range. $23,000-$31,000 per year Postmaster. Salary range. $24,500-$26,500 per year.