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Interagency Mail Service

Procedures for State of Illinois Interagency Mail Service

  • Interagency mail should be addressed as legibly and accurately as U.S. mail. Give the recipient's first and last name and the complete department name and location. Always include a complete return address.
  • Separate outgoing mail into two stacks: interagency mail and U.S. Postal Service mail.
  • Interagency mail is transferred to/from the Springfield and Chicago hubs on Tuesday and Thursday. Once it is transferred to these hubs, it will be delivered to the offices as listed in the service guide. Please plan accordingly.
  • Interagency mail may also be dropped off at a CMS mail center prior to 3:30 p.m.
  • Contact the CMS Springfield or Chicago office to arrange for a large pickup.
  • Contact your agency mailroom team if you wish to expand or change your interagency mail service.

Contact Information

Mail & Messenger Services
200 E. Ash St.
Springfield, IL 62704
Phone: (217) 782-2536 - Ext. 200 or 204

Mail & Messenger Services
555 W Monroe St Fl 1
Chicago, IL 60661-3605
Phone: (312) 814-2196