Almost every company uses one predictable format. Find one confirmed address and you have the pattern for everybody — the work is in confirming it rather than guessing it.
Companies pick a format and apply it to everyone: first.last, flast, first, or firstl. Any single confirmed address at that domain gives you the rule. Press pages, published contacts, support addresses and conference talks are all places a real address appears in public.
This is the step people skip, and it is the one that does real damage. Take the domain from the company's own website, not from the obvious variant of their name. Typo-squat domains of well-known companies are routinely registered by others, and many run catch-all mail servers that accept every address — so a wrong guess there never bounces, never tells you it was wrong, and quietly delivers your note to a stranger who collects it.
Do not send to several guesses at once hoping one lands — the wrong ones reach real colleagues and make the right one look like spam. Do not use a personal address you found somewhere it was not published for that purpose. And do not assume a pattern from one company applies to a subsidiary or a recent acquisition; those frequently keep their own domain and format.
Verified addresses where they exist, and honestly labelled guesses where they do not.
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