A cold email is an interruption. The person did not ask for it, does not know you, and owes you nothing. Everything that follows comes from taking that seriously — not as an apology, but as a design constraint.
Under 150 words. Ideally under 100. Long enough to be specific, short enough to read on a phone between two other things — which is where most first reads happen. Every sentence that does not earn its place makes the ones that do less likely to be read.
Most cold email fails before writing begins, in the choice of who to write to. A perfect message to someone with no plausible reason to care will not work. A clumsy message to someone with an urgent, relevant problem often will.
If your reply rate is near zero, look at your targeting before your copy. Building a real ideal customer profile usually moves the number more than any rewrite.
Under 150 words, ideally under 100. The first read almost always happens on a phone, quickly, between other tasks. Length competes directly with the chance of being read at all.
The opening line, yes — genuinely, not with a merged field. That single sentence is what separates a message from a mail-out. The rest can follow a consistent structure. Doing this by hand takes eight to twelve minutes per company, which is exactly why it gets abandoned and why automating the research is worth more than automating the sending.
Short, lowercase, specific, and no promise the body does not keep. Two to five words that read like internal mail rather than marketing. Subject lines matter less than the folklore suggests and matter not at all if your mail is being filtered before delivery.
At most one link, and no attachments. Multiple links look like a campaign, and attachments from strangers are treated with suspicion by both filters and people. Save the detail for after they reply.
The Cold Outreach Machine finds the companies you sell to, writes a different email for each one, and sends them on its own — paced, inside working hours. US$299.99, paid once, live setup call included.