James MacMannis and his wife listen to their ham radio

James ‘Dad Mac’ MacMannis is believed to have sent as many as 33,000 postcards during World War II.

WEST PALM BEACH — Dad Mac sat in his living room and furiously scribbled the names the German propaganda machine rattled off. Names of GIs whose moms and dads and siblings and sweethearts in Florida and Iowa and Oregon. Loved ones who for weeks or months had wondered and worried and wrung their hands. Mac would fill out and address a postcard. It would say: Your boy is alive.

As World War II raged, and before and after D-Day, James L. MacMannis wrote as many as 33,000 postcards to families across America. After a while, people called him Dad.

At first, he said, he sent out just a few cards, and he got few responses.

“I was discouraged,” he told Palm Beach…