Run cold outreach at scale
Sending personal emails one by one does not scale, but sending in bulk lands in spam and burns the domain.
Tools worth considering
lemlist
Multichannel cold outreach with email sequences, LinkedIn automation, a built-in lead database and deliverability warm-up.
No free plan; 14-day trial without a credit card, extended 30-day trial for new signups. Email plan $55/user/mo billed annually ($69 monthly) with 50,000 emails/mo; Multichannel $87/user/mo annually ($109 monthly) with unlimited emails and messages; Enterprise on request
Clay
Data enrichment and research platform where a spreadsheet-style table runs waterfalls across many providers and an AI agent researches accounts.
Free plan: 500 actions/mo, 100 data credits/mo, up to 200 rows per table, no phone enrichment, signals, CRM integrations or webhooks; Launch from $167/mo billed annually or $185 monthly, with 15,000 actions and 2,500 data credits; Growth from $446/mo annually or $495 monthly, with 40,000 actions and 6,000 credits; Enterprise on request
Instantly
Cold email platform built for volume, with unlimited sending accounts, automated warm-up, a lead database and a shared inbox.
Outreach plans: Growth $47/mo (unlimited email accounts and warm-up, 5,000 emails/mo, 1,000 uploaded contacts); Hypergrowth $97/mo (125,000 emails, 25,000 contacts); Lightspeed $358/mo (500,000 emails, 100,000 contacts). Bundles including lead credits: Starter $94/mo, Scale $194/mo, Agency $555/mo, Enterprise on request
The problem
Cold outreach fails in two opposite directions. Done by hand it works and does not scale: fifty genuinely researched emails take a day, and a day a week does not fill a pipeline. Done in bulk it scales and does not work: a thousand identical emails from one mailbox get filtered, the reply rate rounds to zero, and the domain that also carries your invoices and customer email picks up a reputation problem.
Underneath both sits the real constraint, which is relevance. A list of ten thousand companies that vaguely match a size filter produces the generic message that gets ignored. The teams that succeed at this are not sending more, they are sending to a narrower group with a specific reason.
What AI can actually do here
Three jobs, and they map to three tools rather than one.
The first is building the list. Enrichment platforms take a rough set of companies and fill in the missing pieces, running several data providers in sequence so a work email that one vendor lacks another supplies. AI research agents answer a question per row, such as whether a company uses a particular platform or recently opened a location, which is what turns a demographic list into a signal-based one.
The second is deliverability. Warm-up gradually builds sending reputation on new mailboxes, verification removes addresses that would bounce, and spreading volume across many mailboxes and domains keeps any single one below the threshold where filters act.
The third is sequencing and replies: multi-step follow-ups across email and other channels, with every reply landing in one inbox.
What none of this does is make a weak offer work. Automation multiplies whatever you already have, including irrelevance, and the fastest way to burn a market is to reach all of it with a message that does not land.
How the tools differ
Clay builds the list. Waterfall enrichment across more than 150 providers and the Claygent research agent turn a spreadsheet into researched targets. Free gives 500 actions and 100 data credits per month with a 200-row cap, and Launch starts at $167 per month billed annually.
Instantly is the volume infrastructure. Unlimited email accounts and unlimited warm-up on every plan, a shared Unibox for replies, verification and a lead database, with outreach plans from $47 per month. It exists for operations running many mailboxes across several domains.
lemlist is the multichannel option. Sequences that move between email, LinkedIn, SMS and WhatsApp, with a lead database, finder and warm-up included, from $55 per user per month billed annually on the Email plan and $87 on Multichannel. See Instantly vs lemlist for that choice.
When you don't need a tool
If your best customers came from referrals and your network is not exhausted, work the network first. It converts better than any cold campaign and it costs nothing but attention.
If you sell to consumers, cold outreach is usually both ineffective and legally awkward. The rules are stricter, the tolerance is lower, and the same effort spent on content or ads reaches people who chose to be reached.
And if you are sending fewer than a few hundred emails a month, do it by hand from your normal mailbox. Personal beats automated at that volume, and you avoid a monthly cost, a warm-up period and the risk of damaging a domain you need for real business.
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Frequently asked questions
Is cold email legal?
It depends on where your recipients are and it is your responsibility, not the tool’s. In the EU you need a lawful basis under GDPR, accurate sender identification and a working opt-out, and several countries add stricter national rules. Treat the legal question as part of the setup rather than something to check after the first campaign.
Why do I need a separate domain for outreach?
Because reputation damage is contagious. If cold campaigns cause spam complaints on the domain that also sends your invoices and customer replies, that normal mail starts landing in junk folders. Sending from separate domains keeps a bad campaign from taking your operational email with it.
How long does warm-up take before I can send?
Plan for several weeks on a new mailbox, and increase volume gradually after that while watching bounce and reply rates. This is the step people skip when they are impatient, and skipping it is the single most common reason a campaign lands in spam despite good copy.
Should I buy a lead database or build the list myself?
Both, in that order of scepticism. Bundled databases are convenient and their coverage varies, while enrichment tools like Clay let you verify and add the signals that make a message relevant. Whichever route you take, check a sample by hand before sending, because bounces from a bad list damage the domain you just warmed up.