The latest batch of Mayor Bill de Blasio’s emails reveal how his relationship with Gov. Andrew Cuomo turned toxic — and led de Blasio to veto “any and all” cooperation nearly four years ago.

Several emails deal with the controversy that erupted in December 2014, when the Patrolmen’s Benevolent Association urged police to bar de Blasio from cops’ funerals if they were killed in the line of duty, in response to Hizzoner’s handling of the police chokehold death of Eric Garner on Staten Island.

On Dec. 14, de Blasio wrote that Cuomo had “suggested a breakfast mtg with him and [PBA chief Patrick] lynch after which lynch apologizes.”

But the next day, Cuomo publicly praised Lynch as a “fine” leader who was “standing up for the police, which is his job.”

De Blasio then fired off a furious, Dec. 16 order freezing relations with the governor.

“And from now on: the answer to any and all requests from the Cuomo Administration is NO. The default position is NO. Then we will decide if and when there should be any yesses,” the mayor told his aides.