Run large-scale cold email campaigns with Claude Code
The poster uses Claude Code to run cold email workflows sending 10-20K emails per client monthly, replacing a Clay bill. ·
Done withClaude Code
- What they did
- The poster says they built a single outbound plugin around Claude Code agents that automates most of a cold email agency workflow: buying domains through Namecheap, setting DNS in Cloudflare, creating inboxes with Zapmail/Aerosend, warming them, researching offers with scraped company and competitor data, mapping TAM, enriching leads, finding and verifying emails, and setting up campaigns. A person still steps in most during TAM mapping, where a growth manager starts each client’s mapping and adjusts the skill for unusual markets.
- How it went
- They say this let them cancel a $350/month Clay subscription and run outbound solo, with most clients sending at least 40,000 emails a month and some near 100,000. In comments they report roughly 2% to 4% reply rates, while noting results depend mostly on the offer.
- Worth knowing
- The biggest catch is maintenance and human oversight in TAM mapping; the post says this is still a big human-in-the-loop system for unique markets.
Try it yourself with Claude Code
Help me set up a cold email workflow for [client or business] targeting [audience description]. Build a lead list of [number] contacts from [data source or CSV], enrich each with [fields like role, company, recent news], and write personalized first lines and a [number]-step sequence in [tone]. Save everything as a CSV ready to import into [sending tool]. Before sending or scheduling anything, pause and show me a sample of [10] emails and the send settings for approval.
Want help getting this working? Join the Vibe Coding Academy ↗ Run by Alex Finn, who also runs this site.
Source: Reddit · Apr 2, 2026
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