Cold email that reads like someone actually did their homework.
Describe the person you want to reach. Mailer returns a named list with verified emails and a fully researched, individually written email for each one. No shared template exists.
The problem
Personalization works. Doing it at scale doesn't.
You know a researched, individual message outperforms a blast. But researching each lead and writing each email is hours of work your team doesn't have — so you default to templates and accept the results.
Generic mail-merged sequences that recipients recognize instantly
SDR time spent on research instead of conversations
Clay buildout that your team has to maintain forever
Reply rates under 2% that make pipeline math impossible
How it works
From description to delivered campaign in one step.
01
Describe the person
Write a plain-English description of who you want to reach. Use plain language — 'CEOs of Israeli cybersecurity companies' or 'CFOs at PE-backed manufacturing firms in the Midwest'. No boolean query syntax required.
02
Mailer discovers the list
A tiered pipeline routes your query through Apollo, Exa Websets, and Exa Research Pro depending on complexity. Simple B2B profiles, complex biographical targets — both return real named individuals with verified emails.
03
Each lead is researched in depth
Four parallel research calls per lead — LinkedIn, recent news, personal sites, structured synthesis — produce a PersonBiography unique to each recipient. No shared template exists at this stage.
04
Emails are written and sent
Gemini writes a personalized email + two follow-ups for each recipient using their biography. Delivery goes through SmartLead with per-lead custom variables. You review intent before anything sends.
Use cases
Three entry points. One output standard.
Audience discovery
Describe the ideal recipient in plain language. Get a named list with verified emails and a personalized email ready to send. The highest-wow entry point for new clients.
Bring your own data
Upload your CRM export or existing lead list. Mailer applies the full research and personalization layer without the discovery cost — same output quality, your existing contacts.
Dormant lead reactivation
Stalled deals in your CRM that went cold. Mailer researches what changed in each lead's world and writes a fresh, informed angle to restart the conversation.
Comparison
Why not Clay, Apollo, or AI SDR agents?
Each alternative solves part of the problem and leaves the rest to you. Mailer is the only option that covers the full loop from description to delivered campaign.
| Capability | Mailer | Clay | Apollo | AI SDR agents |
|---|---|---|---|---|
| Natural-language audience discovery | ||||
| Biographical / non-LinkedIn targets | ||||
| Individual email per recipient (no template) | ||||
| Done-for-you (no infrastructure to own) | ||||
| Human review before send | ||||
| ~$0.05 cost per lead |
Who it's for
Built for revenue teams with a high-ACV product to protect.
When one closed deal from an outbound campaign is worth $50k–$500k, the ROI math on Mailer is obvious. We work best with teams who are already doing outbound and want dramatically better results — not teams starting from zero.
Head of Sales, VP Sales, CRO, or Revenue Ops at a $10M–$100M ARR B2B company
Internal sales team with SDRs or AEs doing outbound
High-ACV product ($20k–$500k+ deal size) — one closed deal pays back the campaign many times over
Dissatisfied with reply rates below 2% from mass-send tools
Heard of Clay but don't want to own the infrastructure
One campaign that closes a $100k deal pays for itself 50 times.
Tell us who you want to reach. We'll scope the campaign, show you a sample, and send you a price before any commitment.
No commitment. Sample before you pay.