Jobs at small Pittsburgh companies nobody posts about (Pittsburgh)

I asked around at a community meeting and got three leads. Any experience at all would help. They like a brief email with a résumé. What do you write in a cold email?

Small employers often hire on recommendation. Ask neighbours, former co-workers and your library.

A short email with two sentences about what you can do and your résumé attached worked for me. I followed up after a week.