Billionaire Hank Greenberg’s long battle to obtain private e-mails of Eliot Spitzer were slowed yesterday when the current state attorney general sought to overturn a court order mandating their disclosure.

Spitzer, when serving as AG, used private e-mails as part of his official campaign to crack down on Wall Street.

A judge last month ordered state Attorney General Eric Schneiderman to dig up and turn over e-mails in question.

Schneiderman filed last week to appeal the order, but declined comment, as did Greenberg’s spokesman.

Greenberg, the founder of insurance giant AIG, wants the secret e-mails to help clear his name and dismiss Spitzer’s 2005 financial frauds lawsuit against him.

Spitzer’s lawsuit against Greenberg led to the CEO’s ouster in 2005 and the eventual demise of AIG’s fortunes.

The appeal motion, which didn’t disclose how many e-mails might be involved, was seen as an acknowledgment that e-mails might still exist from Spitzer’s original prosecution.