An application into a portal competes with hundreds. A note to the person who owns the role competes with almost none. The hard part is knowing who that is, and being right.
Sources are tried in order of how much they can be trusted and how much they cost, so the most authoritative answer is usually also the free one.
A contact from a profile search has to be corroborated before it is used — by the company's own site, by a provider, or by a verified address on the company's exact domain. Without that, a same-named person at a different company gets emailed about a role they have never heard of. The guard exists because that happened: the founder of a defunct startup called Meta was once offered as the hiring team for a role at Meta Platforms.
A confirmed address is marked confirmed. A pattern guess is marked a guess, and shown with its confidence, so you always know which one you are about to email. A domain that turns out to be wrong can be blocked outright so it is never used or rediscovered again.
For every job you apply to, with the working ones marked and the guesses labelled.
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