# Introducing Claude for Cold Email Infrastructure

Your agent can now buy the sending domain, wire SPF, DKIM and DMARC, create the inbox, send, and read what comes back. One balance, priced per call.

Published September 4, 2026 · https://www.routergrowth.com/launches/claude-for-cold-email-infrastructure

## Give this to your agent

```
Set up https://www.routergrowth.com/SKILL.md, then set up cold email infrastructure for acme: find a domain, register it, wire SPF, DKIM and DMARC, create an inbox and send me a test.
```

## Sending one cold email takes four subscriptions.

No single vendor sells the whole path. So the setup gets spread across a registrar, a mailbox, a sender and a monitor, four logins, four invoices, before your agent sends anyone anything.

| Vendor | Plan | Per year |
| --- | --- | --- |
| Namecheap | .com domain, renewal | $17 |
| Google Workspace | Business Starter, one mailbox | $84 |
| Instantly | Growth, annual | $451 |
| MailReach | All-in-one, one mailbox | $234 |
| **Per year, before one email** | | **$786** |

**Funded team: Buys all four. Hires the wiring.** Registrar to DNS to mailbox to sender to monitor. That chain is cold email infrastructure, and it used to cost four contracts and a week of someone's time.
**Everyone else: Sends from the company domain. Burns it.** One deliverability problem on the domain your invoices go through, and the campaign costs you the company's email.

_Cheapest paid tier of each vendor, public pricing September 2026, one domain and one mailbox. Warm-up is bundled in Instantly; MailReach is counted for spam tests and reputation monitoring._

## Now your agent builds the stack.

Nothing to learn, nothing to wire. Describe the domain you want and Claude buys it, writes the records, checks them, opens the inbox and sends, paying only for the calls it made.

- **Buys the domain** Availability and price across TLDs, then the purchase, with you as the registrant and WHOIS privacy on. (`domain.search → domain.register`)
- **Wires the authentication** SPF, DKIM and DMARC come back as records. The agent writes them and re-checks until the domain reads verified. (`email.domain → domain.dns`)
- **Checks before it sends** Re-checks are free. Nothing sends from a domain that has not verified. (`email.domain · re-check · $0`)
- **One balance** Registrar, DNS, mailbox and sending all bill the same prepaid balance. No seats, no contracts, no minimums. (`eight calls · one receipt`)

## A run, step by step

> Set up cold email infrastructure for acme: find a domain, register it, wire SPF, DKIM and DMARC, create an inbox and send me a test.

| Step | Capability | Detail | Outcome | Price |
| --- | --- | --- | --- | --- |
| 1 | `domain.search` | acme, six TLDs | getacme.com available | $0.002 |
| 2 | `domain.register` | getacme.com, 1 year | registered, privacy on | $18.00 |
| 3 | `email.domain` | getacme.com | 4 DNS records returned | $1.995 |
| 4 | `domain.dns` | getacme.com | 4 records written | $0.002 |
| 5 | `email.domain` | re-check | verified | $0 |
| 6 | `email.inbox` | alex@getacme.com | created | $1.995 |
| 7 | `email.send` | test to you | sent | $0.003 |
| 8 | `email.messages` | inbox read | 1 reply | $0.002 |
| | | | **handed back: alex@getacme.com, verified and sending** | **$21.999** |

_Prices are the live RouterGrowth per-call prices for each capability. The domain price is quoted from the registrar at run time (registrar price x 1.15 plus $3); the figure shown is a .com today. The domain and the inbox are placeholders._

## Stop buying four seats. Stop wiring them.

$786 a year bought you four logins and a week of DNS. Claude builds the same stack for $22, most of it the domain itself, and then sends for $0.003 an email.

- RouterGrowth, one authenticated inbox, once: $21.999
- Four subscriptions, per year, before one email: $786

## Replaces the stack. Keeps the sources.

Every name below is live on RouterGrowth today, priced per call, reachable from the same balance.

- **Infrastructure:** [Name.com](https://www.routergrowth.com/providers/namecom), [AgentMail](https://www.routergrowth.com/providers/agentmail)
- **The data behind the campaign:** [LeadMagic](https://www.routergrowth.com/providers/leadmagic), [Apify](https://www.routergrowth.com/providers/apify), [DataForSEO](https://www.routergrowth.com/providers/dataforseo), [fal](https://www.routergrowth.com/providers/fal)

## Go beyond infrastructure, without another account.

Add the list, the signal and the creative to the same balance whenever the campaign needs it.

- [`company.jobs`](https://www.routergrowth.com/catalog/company.jobs): hiring signals
- [`people.search`](https://www.routergrowth.com/catalog/people.search): people lists
- [`contact.find`](https://www.routergrowth.com/catalog/contact.find): email finder
- [`contact.verify`](https://www.routergrowth.com/catalog/contact.verify): email verifier
- [`company.funding`](https://www.routergrowth.com/catalog/company.funding): funding rounds
- [`social.profile`](https://www.routergrowth.com/catalog/social.profile): profiles for personalization
- [`ads.search`](https://www.routergrowth.com/catalog/ads.search): competitor ads
- [`aeo.answer`](https://www.routergrowth.com/catalog/aeo.answer): AI assistant answers
- [`seo.serp`](https://www.routergrowth.com/catalog/seo.serp): live SERPs
- [`creative.image`](https://www.routergrowth.com/catalog/creative.image): ad creative
- [`web.scrape`](https://www.routergrowth.com/catalog/web.scrape): any page as markdown
- [`local.places`](https://www.routergrowth.com/catalog/local.places): Google Maps places

## What does each call cost?

| Capability | What it returns | From |
| --- | --- | --- |
| [`domain.search`](https://www.routergrowth.com/catalog/domain.search) | Check which domains are available and what they cost to register through RouterGrowth: a name across common TLDs, or one exact domain. | $0.002 |
| [`domain.register`](https://www.routergrowth.com/catalog/domain.register) | Buy a domain for outbound sending. Registered in RouterGrowth's registrar account with you as the registrant contact; WHOIS privacy on; transferable to you on request. | $18.00 |
| [`email.domain`](https://www.routergrowth.com/catalog/email.domain) | Bring your own domain for outbound: registers it, returns the DNS records and a one-click setup link, and reports verification status. Run again to re-check. | $1.995 |
| [`domain.dns`](https://www.routergrowth.com/catalog/domain.dns) | Create DNS records on a domain registered through RouterGrowth: the records email.domain asks for, or anything else. | $0.002 |
| [`email.inbox`](https://www.routergrowth.com/catalog/email.inbox) | Create (or fetch) a sending inbox owned by your organization, on the shared domain or on a domain you verified with email.domain. Idempotent per name. | $1.995 |
| [`email.send`](https://www.routergrowth.com/catalog/email.send) | Send an email from one of your inboxes, or reply within a thread. You are the sender of record: consent and unsubscribe handling are yours. | $0.003 |
| [`email.messages`](https://www.routergrowth.com/catalog/email.messages) | Messages in one of your inboxes, newest first: replies, bounces and opens as labels. Poll it after a send. | $0.002 |

## FAQ

### Who owns the domain?

It is registered in RouterGrowth's registrar account with you as the registrant contact and WHOIS privacy on, and it is transferable to you on request. Renewal is not automatic unless the run sets auto_renew, so a domain you stop using simply lapses.

### Can I use a domain I already own?

Yes. email.domain takes any domain or subdomain you control and returns the records to add; you write them wherever your DNS lives. The registrar and DNS steps drop out, and the receipt is the sending domain plus the inbox, about $4.

### Does the agent warm the domain up?

No. A new domain has no sending history, and the only thing that builds one is verified recipients who engage. Start at 10 to 20 emails a day, watch bounces and complaints, and verify every address with contact.verify before it enters the inbox. The cold email infrastructure guide has the week-by-week schedule.

### What does it cost after the setup?

$0.003 per email sent and $0.002 per inbox read. The inbox is charged once. The domain renews at the registrar's price if you asked for auto-renew, and the sending-domain re-checks are free.

## Infrastructure used to need a week. Now it needs one line.

Start with $1 in free RouterGrowth credit.

- [Get started](https://www.routergrowth.com/dashboard) · [Agent skill](https://www.routergrowth.com/SKILL.md) · [More launches and guides](https://www.routergrowth.com/use-cases/llms.txt)

## More details

- https://www.routergrowth.com/use-cases/cold-email-infrastructure
- https://www.routergrowth.com/use-cases/find-high-intent-leads
- https://www.routergrowth.com/use-cases/waterfall-email-enrichment