The U.S. Postal Service has placed a pause on some changes to its mail delivery network after senators expressed concerns the changes would disrupt how people get the mail.

A group of senators, led by Sen. Gary Peters (D-MI), expressed concerns over how the changes would consolidate mail processing centers, and Postmaster General Louis DeJoy told senators in a letter earlier this month that he would pause any changes until next year. While the lawmakers were pleased to see the pause, they still want an advisory opinion from the Postal Regulatory Commission on the proposed changes. Here is what the changes are and how they could affect mail service.