"I am deeply sorry and I apologize for letting down my family and the people of Florida I have had the privilege to represent," he said in a statement issued by his office.
The two-sentence statement did not refer to the e-mails and gave no reason for Foley's abrupt decision to abandon a flourishing career in Congress.
Foley, 52, had been a shoo-in for a new term until the e-mail correspondence surfaced in recent days.
His resignation comes less than six weeks before the elections and further complicates the political landscape for Republicans, who are fighting to retain control of Congress. Democrats need to win a net of 15 Republican seats to regain the power they lost in 1994.
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