Cold email vs LinkedIn outreach: 1.08M emails and 24K invites, compared

One funnel, two channels, twelve months

The numbers on this page come from a single client engagement. The client stays unnamed, and the funnel is published on our case studies page: over 12 months the program sent 1,080,000 cold emails and 24,000 LinkedIn invites, and the combined funnel produced 5,028 replies and 263 qualified sales meetings, all tracked in one client portal. We report replies and SQLs combined because that is how the pipeline was actually built: the channels ran side by side at the same market, and splitting the credit per channel after the fact would be inventing precision the data does not have.

The 45-to-1 volume gap

Divide the two totals and you have the story: 1,080,000 emails against 24,000 invites is a 45-to-1 volume ratio, inside one program that was deliberately using both channels. That ratio is not a preference, it is structure. A LinkedIn seat is capped in how many invites it can safely send, so 24,000 invites in a year, about 2,000 a month, already represents sustained, intentional effort. Email has no equivalent program-level cap: 1,080,000 emails a year is 90,000 a month, and at 10 to 12 emails per Google Workspace mailbox per day that takes a fleet of several hundred warmed mailboxes, depending on how many days a month each one sends. Scaling email means adding mailboxes, each needing 2 to 2.5 weeks of warmup before it carries campaign volume. Scaling LinkedIn means adding seats, and usually the people behind them.

What each channel costs to run

At the sticker, LinkedIn looks cheap: HeyReach, the LinkedIn line in our own stack, lists at $79 per sender per month. Email carries real infrastructure. At 50,000 emails a month, the verified list prices total $2,841 all-in, with mailboxes the largest line at $1,412 and the email sequencer at $699. That works out to under six cents per email sent, and the stack gets cheaper per send as it scales: $5,531 a month at 100,000 emails, $12,036 at 250,000, $44,090 at 1,000,000. The full tier table is on our ROI calculator. The trap in a naive cost comparison is that $79 buys a seat, not volume: the binding cost on LinkedIn is the human time behind each seat, and that never shows up on the invoice.

Where LinkedIn earns its seat

The 2,000 invites a month in this engagement were not a failed attempt at scale. They were an aimed instrument: invites and profile visibility pointed at the accounts worth an extra touch, so the prospect had already seen the name before the email asked for anything. That is what LinkedIn does that email cannot: a visible profile, mutual connections and social proof make the touch warmer before a word is exchanged. The honest trade is that every one of those touches consumes seat capacity and human attention, which is exactly the resource email is designed not to spend. So the question is never email or LinkedIn, it is whether your average deal size pays for running the precision layer on top of the engine.

The verdict: volume engine, precision layer

Run email as the backbone and size it honestly: pick a daily volume, divide by 10 to 12 to get the Google-pool mailbox count, and plan capacity on 2 touches per lead, the same assumption our ROI calculator uses. Then layer LinkedIn on the accounts where a closed deal covers months of both stacks, rather than spreading invites thinly across the whole list. If the deal size does not justify a second channel, email alone is the defensible choice, because it is the one that scales without headcount. The cold email guide covers how we build the engine, and pricing explains the revenue-share model it runs under.