Newsweek reached out to the USPS via email for comment. Beginning April 1, the USPS will adjust service standards for first-class mail, periodicals, marketing mail, and package services.

For large envelopes, you can mail them for $1 per ounce of weight. 00 + $0. Each additional ounce will cost you an additional 21 cents. First Class Mail Letter (1 oz.) costs $1.10 per letter. Amounts ...