Jobs at small Tucson companies nobody posts about after 13 years as a welding apprentice

A friend who works at a local manufacturer says there are openings not advertised online. I would rather hear the honest version than the polite one. They like a brief email with a résumé. What do you write in a cold email?

Keep a list of who you contacted and when. It makes follow-ups easy.

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