Agent skill

email-infra

Set up and run cold email sending infrastructure (domains, DNS, mailboxes, warmup) through the ColdIQ marketplace Instantly endpoints.

activeSelf-containedInstructions only607 words

Filed under Outbound email.

From Cold-IQ/coldiq-marketplace-skills · 17 skill entries · 1 · pushed 2026-09-22

What it does when it runs

Set up and run cold email sending infrastructure (domains, DNS, mailboxes, warmup) through the ColdIQ marketplace Instantly endpoints. Use when sizing how many domains/mailboxes are needed, provisioning sending accounts, ordering done-for-you pre-warmed inboxes, enabling/monitoring warmup, checking domain availability, or troubleshooting deliverability before going live. Triggers on "email infra", "setup domains", "buy domains", "how many mailboxes", "mailbox setup", "warmup", "warm up", "DNS / SPF / DKIM / DMARC", "Instantly setup", "going live", "deliverability", "DFY inboxes", "pre-warmed domains". Do NOT use for writing campaign sequences or copy (see instantly-api / cold-email-copy) — this skill is about the sending infrastructure, not the campaigns that run on it.

Automated analysis of the skill and the 0 files bundled beside it. A skill’s own description is written to be selected by an agent, so it describes the job and not the dependencies.

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Hosts it reaches: No third-party host appears in the skill or its bundled files.
Tool permissions it declares: No allowed-tools in the frontmatter. It only issues instructions, so there is nothing to bound.
Actions present in the files: None. Instructions only.

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Install it

View source on GitHub ↗

git clone --depth 1 --filter=blob:none --sparse https://github.com/Cold-IQ/coldiq-marketplace-skills.git /tmp/coldiq-marketplace-skills
git -C /tmp/coldiq-marketplace-skills sparse-checkout set "skills/email-infra"
mkdir -p ~/.claude/skills/email-infra
cp -R "/tmp/coldiq-marketplace-skills/skills/email-infra/." ~/.claude/skills/email-infra/

Picked up without a restart. A project skill of the same name is shadowed by your personal one. For one repository only, swap ~/.claude/skills for .claude/skills. Claude Code docs ↗

Or take the whole library

This repo ships a .claude-plugin manifest, so Claude Code can install all 17 skills at once. Plugin skills are invoked as /<plugin>:<skill>, so they never collide with your own.

/plugin marketplace add Cold-IQ/coldiq-marketplace-skills
/plugin

The folder is the same in every client that implements the format — 46 of them — so if yours is not above, only the destination changes.

The skill

Source on GitHub ↗

Reproduced in full from Cold-IQ/coldiq-marketplace-skills/blob/495c1b4256db8c6683ac1ff59a093899228eca73/skills/email-infra/SKILL.md, which is licensed MIT (repository). 607 words, 8 headings.

Email Infrastructure

Take cold email infrastructure from zero to live: size it, provision mailboxes, warm them up, and verify health — using ColdIQ's resold Instantly account/warmup endpoints (BYOK, free, no ColdIQ credits). Once infra is healthy, hand off to instantly-api for campaigns.

ColdIQ Marketplace Endpoints

Task	Method	Path	Credits	Endpoint ID	Notes
Order DFY pre-warmed inboxes	POST	`/v1/instantly/dfy-email-account-orders`	free	`instantly.dfy_orders.create`	Fastest path to live
Check domain availability	POST	`/v1/instantly/dfy-email-account-orders/domains/check`	free	`instantly.dfy_orders.domains_check`	Before buying
List pre-warmed domains	POST	`/v1/instantly/dfy-email-account-orders/domains/pre-warmed-up-list`	free	`instantly.dfy_orders.domains_prewarmed`	Skip the 2-3 week warmup
Connect a mailbox	POST	`/v1/instantly/accounts`	free	`instantly.accounts.create`	Bring your own mailbox
List mailboxes	GET	`/v1/instantly/accounts`	free	`instantly.accounts.list`	Inventory
Get mailbox health	GET	`/v1/instantly/accounts/{email}`	free	`instantly.accounts.get`	Per-account status
Enable warmup	POST	`/v1/instantly/accounts/warmup/enable`	free	`instantly.accounts.warmup_enable`	Start 2-3 wks before sending
Disable warmup	POST	`/v1/instantly/accounts/warmup/disable`	free	`instantly.accounts.warmup_disable`	Avoid once campaigns live
Warmup analytics	POST	`/v1/instantly/accounts/warmup-analytics`	free	`instantly.accounts.warmup_analytics`	Health scores
Test account vitals	POST	`/v1/instantly/accounts/test/vitals`	free	`instantly.accounts.test_vitals`	Pre-launch check
Daily account analytics	GET	`/v1/instantly/accounts/analytics/daily`	free	`instantly.accounts.analytics_daily`	Monitor live sending

Critical rules (never break)

Never use your primary domain for cold outreach.
Max 2 mailboxes per domain.
One domain = one workspace (never mix).
Use multiple registrars (no single point of failure).
Warm up 2–3 weeks minimum before sending.
Never disable warmup once campaigns are running.
Start conservative, scale gradually.

Infrastructure sizing formula

Monthly goal ÷ 20 working days = daily volume
Daily volume ÷ 20–25 per mailbox = mailboxes needed
Mailboxes × 1.5 (buffer) ÷ 2 = domains needed
Provider split: 60% Google Workspace, 40% Microsoft 365

Example: 3,000/month → 150/day → 10–12 mailboxes → 5–6 domains.

DNS — all 4 records required

Record	Purpose
MX	Routes incoming email
SPF	Declares sending servers
DKIM	Digital signature authentication
DMARC	Policy for SPF/DKIM failures

(DNS is configured at the registrar/provider — ColdIQ doesn't set DNS. Use the DFY order to skip manual setup.)

Setup flow

Size the infra (formula above).
Fastest path — order done-for-you pre-warmed inboxes (skip manual domain/DNS/warmup). → POST /v1/instantly/dfy-email-account-orders · free · instantly.dfy_orders.create
- First check what's available: → POST /v1/instantly/dfy-email-account-orders/domains/pre-warmed-up-list · free · instantly.dfy_orders.domains_prewarmed → POST /v1/instantly/dfy-email-account-orders/domains/check · free · instantly.dfy_orders.domains_check
BYO path — connect your own mailboxes, then enable warmup 2–3 weeks before sending. → POST /v1/instantly/accounts · free · instantly.accounts.create → POST /v1/instantly/accounts/warmup/enable · free · instantly.accounts.warmup_enable
Before launch, confirm health. → POST /v1/instantly/accounts/warmup-analytics · free · instantly.accounts.warmup_analytics → POST /v1/instantly/accounts/test/vitals · free · instantly.accounts.test_vitals
Go live (ramp), then monitor daily. → GET /v1/instantly/accounts/analytics/daily · free · instantly.accounts.analytics_daily

Warmup & ramp

Warmup: Week 1 foundation (no campaigns) · Week 2 building (no campaigns) · Week 3 ready (health 70%+, ideally 90%+). Going-live ramp/mailbox: Wk1 G 10–15 / MS 5–10 → Wk2–3 G 15–20 / MS 10–12 → Wk4+ G 20–25 / MS 12–15.

Healthy metrics

Open 50%+ · reply 2%+ · bounce <3% (target <2%) · spam <0.1% · deliverability >95%. If bounce climbs or vitals drop, pause that mailbox and re-check warmup analytics before resuming.

Other skills for the same job

Different authors, same problem. Matched on the words in the skill name, across every library in the catalogue except this one.

email-infra by Frontal-so · 6
gt-email-infra by Growth-Today · 4
cold-email by coreyhaines31 · 53,460
email-sequence-writer by irinabuht12-oss · 3,698
cold-email-kickoff by growthenginenowoslawski · 739
cold-email-starter-kit by growthenginenowoslawski · 739
cold-email-weekly-rhythm by growthenginenowoslawski · 739
email-deliverability-audit by growthenginenowoslawski · 739

Need help setting it up?

This page tells you what email-infra does and what it needs. Cheetah builds the agent setup it runs inside: data, CRM, sequencing and the guardrails.

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