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Illinois is one of the few states (California, Connecticut, Florida, Maryland, Massachusetts, Montana, Nevada, New Hampshire, Pennsylvania and Washington being the others) that requires the consent of both parties for the recording of a conversation. Meaning, so long as you believed this to be a private conversation and you did not give consent to record, it would be unlawful for your friend to have made the recording.
With this in mind, you might consider calling the police. You could let them know that this conversation was recorded without your knowledge and consent. If you have any proof of the recording, such as the email or a witness that has heard the recording, it would be helpful to provide law enforcement with that information. They would then investigate the matter and, if appropriate, effectuate an arrest.
Even if the police are unable to make an arrest, my guess is that there mere interaction with this person will convince him to cease his actions. In either event, it would seem likely that this would resolve the matter for you.
Please let me know if anything requires clarification.
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