
Postal rates will change again effective January 22, 2017.
Chronicle of Philanthropy reports New Postal Rates Will Boost Costs for Charities. Article says increase for charities will range from 2.8% up to 4.3%.
A significant change is that mail which was previously marked as “standard” will now be categorized and marked as “marketing mail.” That is a concern for an industry representative who said that may reduce the likelihood of recipients actually opening such items, which would obviously reduce the effectiveness of a mailing.
You can find the new rates at the USPS site: January 2017 Price Change.