The New York Post (http://bit.ly/12DfUo6) and the Daily News (http://nydn.us/14GNB3q) report that 32-year-old special-education teacher Matthew Maleski was responding to personal ads on Craigslist when he sent photos of himself wearing only boxer shorts.
The messages were then discovered by another teacher with whom he shared the email account.
Investigators for the city's Department of Education say Maleski admitted to sending the photos, but said he did it during non-work hours, and had meant to use his personal account to send the messages.
He lost his job at a Manhattan school earlier this week.
The newspapers say Maleski didn't return phone messages.