NEW MILFORD — Until Sabina Jahic found an envelope in her mailbox with “NO ARABS” written on it, she had thought she was done with messages attacking her Muslim faith.

For more than two decades, she hadn’t seen anything similar. She’d seen plenty before her family moved to New Milford 21 years ago, after fleeing their native Bosnia because of civil war and genocide. And she chose to immigrate to the U.S. because of its “history, constitution and diversity.”

Then her husband picked up the mail on Monday and found a letter addressed to her that seemed to have been delivered to the wrong home, and then delivered to them.

Scrawled in big letters across the front was, “NO ARABS” followed by a garbled phrase that appeared to say “LIVE HERE.”

“I was speechless,” Sabina Jahic said. Decades ago she saw similar messages in Bosnia-Herzegovina, before the beginning of ethnic cleansing that forced them to leave.

The family is not of Arab descent, but they are nonpracticing Muslims, Sabina Jahic said. She said she thinks whoever wrote the message did so because of her name, but there is no way to know.

“Deja vu,” she said. “I know from firsthand how these things can end up.”

An estimated 80,000 Bosnian Muslims were killed during the Bosnian Civil War from 1992 to 1995, according to the U.S. Holocaust Memorial Museum.

Sabina’s daughter, Melisa Jahic, posted a photo of the letter to a town Facebook page Tuesday. She didn’t cite her family’s refugee past, but did say how upsetting the message was.

“As I write this post, my heart is pounding and my mind is filling with about a million angry thoughts,” she wrote.

By Thursday morning, town residents had commented 69 times, all with messages of support for the family.

“I am so sorry someone did that to you and your family,” one commenter said.

“I’m so sorry you and your family continue to get harassed. This is so ignorant and stupid,” another added.

The family has a few theories about who could have written on the letter — neighbors or former neighbors, Sabina Jahic said.

Local U.S. Postal Service Supervisor Joseph Varughese said he will refer the issue to the U.S. Postal Inspection Service, the agency’s law enforcement arm, so it can seek the person who wrote on the envelope.

But a Postal Inspection Service official said on Thursday there is likely little it can do. The service acts only if a message is threatening, the official said, adding that unless you threaten someone, you can send any message through the mail.

After the family looked at the envelope and talked it over, they decided it was likely just a prank, Sabina Jahic said. The family loves and trusts their friends and neighbors, she said.; 203-731-3411; @bglytton