10 ILCS 5/20-1b
The election authority shall give each voter who requests a ballot under the provisions of Article 20 the opportunity to provide an electronic-mail address beginning January 1, 2012, provided that the voter may opt out of providing an electronic-mail address. An electronic-mail address provided shall not be publicly available and is exempt from disclosure under the Freedom of Information Act. Neither an election authority nor the State Board of Elections may release a voter's electronic-mail address to any third party. An election authority may use the address only to communicate with the voter about the voting process, including transmitting military-overseas ballots and election materials if the voter has requested electronic transmission, and verifying the voter's mailing address and physical location as needed. Any other use or disclosure is prohibited, and each request for an electronic-mail address shall so state.
10 ILCS 5/20-1b