The feds have busted a Canadian man for mailing an envelope containing white powder and a note indicating it was anthrax to a Manhattan bar, authorities said Monday.

“Its [sic] called Antrax [sic]. Enjoy,” reads the note allegedly penned by Ameen Keshavjee and sent Dec. 5 to East Village gay bar Nowhere, according to Manhattan federal court papers and prosecutors.

The substance tested negative for anthrax, the document says.

The terrifying note allegedly came after Keshavjee sent threatening emails to unnamed bar employees for months because they told him in February he was no longer welcome if he continued to harass a particular staff member online.

Keshavjee stopped visiting the bar, and instead began sending messages where he told the staffers he hoped they died of AIDS so he could attend the funerals and pee on their coffins.

“After the way you 3 three s–ts repeatedly harassed, bullied and intimidated me YOU LOW-LEVEL HUMAN garbage decided that **I** crossed a line??? DIE OF AIDS, you leftie, hypocrite, democrat-voting F–KS!!!!!!!!!” reads a Feb. 25 email addressed to someone identified in court papers only as “Employee-1.”

“I will be there to pe[e] on your individual coffins!” the email concludes.

Two days later, he allegedly wrote “You miserable f-g s–t. U r a coward, picking on the quietest person in the shop. I hope [employee-1’s Partners] gives u AIDS. I miss my little spot. You f–k.”

In subsequent emails, Keshavjee writes that he wishes the bar employees had been aboard Ethiopian Airlines Flight 302, which killed everyone on board when it crashed in March.

Keshavjee was arrested after authorities discovered he’d used a credit card in his own name to purchase the stamp affixed to the letter he sent the bar.

The unemployed man appeared in court Monday on charges of mailing a threatening communication and false information and hoaxes.

Keshavjee was released on $20,000 bond, and declined comment as he left the courtroom.

He faces up to five years behind bars and deportation if convicted.