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The mechanical checks above catch what filters and thumbs punish. What they can't measure is the only thing that makes cold email work: whether the message names a problem the reader genuinely has, in their vocabulary, with a reason to believe you. That's message-market fit, it's found by testing angles against each other, and it's the whole system behind every number on this site.
Tools check the plumbing. The message is what your market answers. Get your TAM mapped, your ICP broken down and 5 angles written for your buyers, free.