Contact Us Bulk Mail Center 45 N. Charter St. Room 107 Madison, WI 53715-1238View Campus Map Extension Bldg. Mail Center 432 N. Lake St. Room 116 Madison, WI 53706-1498View Campus Map Hours: Mon-Fri, 7:00 AM – 3:30 PM Phone: 262-9973 Email: bulk@postalmail.wisc.edu Hours: Mon-Fri, 7:45 AM – 4:30 PM Phone: 262-3881 Email: mailservices@postalmail.wisc.edu