There’s two sides to every mailer.

Mayor de Blasio on Thursday cast doubt on the Cuomo campaign’s explanation of how a controversial mailer linking the governor’s rival Cynthia Nixon with anti-Semitism was approved.

After days of silence, the Cuomo campaign admitted that former Cuomo aide and close confidant Larry Schwartz approved the message on the double-sided mailer — but after viewing only the non-disparaging side.

“I’ve known Larry a long time — he’s a very smart guy. I wasn’t there, but anyone approving a mailer normally looks at the whole mailer,” de Blasio said at an unrelated press conference in downtown Manhattan.

Hizzoner also renewed his call for the Cuomo campaign and New York State Democratic Committee to come clean with the names of every staffer who was involved in approving the mailing — which was sent to about 7,000 households in predominantly Orthodox Jewish areas of the city earlier this week.

The pamphlet said Nixon supports the Boycott, Divestment and Sanctions movement against Israel — which she doesn’t — and accused her of being silent on anti-Semitism.
Nixon is raising her sons Jewish and attends synagogue.

“Anyone who approved that mailer should be fired. So I don’t think it should be hard for the state party and the Cuomo campaign to say, ‘Here’s everyone who saw it and everyone who approved it,'” said the mayor. “It’s an affront to the Democratic Party, it’s an affront to all of us as New Yorkers.”

The mayor added that if it were his own political campaign under scrutiny, he could produce the names in a snap.

“I could show you very quickly every single human being who signed off on it,” he said.

Cuomo campaign officials didn’t respond to a request for comment.