DeliverabilityPopular
Deliverability audit
Cold emails land in spam or reply rates suddenly drop.
You get Ranked problems · Fix plan · Recovery timeline
Domain warm-up plan Claude skill
Use this before sending any cold email from new domains or mailboxes. New senders have no reputation; ramping too fast is the most common way to burn a domain in its first month.
- 5-step play
- 4 guardrails
- 1 file
- Human approval built in
Use it when you set up new domains or mailboxes for cold email and need a warm-up plan.
Then just ask your agent
“We want to send 500 cold emails a day starting next month. Plan the domains, mailboxes and warm-up.”
Watch it work
One request in, expert work out
What happens when you ask your agent with this skill installed. Every step below comes straight from the skill.
You
We want to send 500 cold emails a day starting next month. Plan the domains, mailboxes and warm-up.
Loaded skill
domain-warmup-plan- Size the infrastructure
- Set up correctly on day 0
- Warm, then ramp
- Gate every step
- Plan the capacity curve
Setup checklist · Week-by-week ramp · Health gates
Ready for your review. Nothing is sent or changed until you approve.
- 5Steps in the play
- 4Guardrails
- 1Files in the skill
- 2 minTo read it all
What good looks like
- First cold sends go to the cleanest, best-fit contacts, which builds reputation from real replies.
- The plan includes spare mailboxes and a resting rotation.
- The common mistake is buying ten domains on Monday and sending 50 a day from each by Friday.
What you bring
- Target daily volume
- Number of domains and mailboxes
- Start date
What you get
- Setup checklist
- Week-by-week ramp
- Health gates
- Capacity forecast
name:domain-warmup-plan
description:Use this skill when you set up new domains or mailboxes for cold email and need a warm-up plan: "how do I warm up a new domain", "warm-up schedule for new inboxes", "how fast…
Use this before sending any cold email from new domains or mailboxes. New senders have no reputation; ramping too fast is the most common way to burn a domain in its first month.
Inputs
- Target cold volume per day across the team.
- Domains and mailboxes planned (or let the plan size them).
- Start date and when the first campaign needs to go out.
The play
1. Size the infrastructure
Mailboxes needed = target daily cold volume ÷ 30-40 per mailbox. Domains needed = mailboxes ÷ 3. Add 20% spare capacity so a mailbox can rest without missing targets.
Example: 600 cold emails a day ÷ 30 = 20 mailboxes; ÷ 3 = 7 domains; plus spare = 24 mailboxes across 8 domains.
2. Set up correctly on day 0
- Domains close to the brand (variations of the company name), never misleading look-alikes of other brands.
- SPF, DKIM, DMARC published and passing; MX records set; domain redirects to the main site.
- Real sender names, photos, signatures.
3. Warm, then ramp
| Week | Warm-up emails per day | Cold emails per day | Gate to move on |
|---|---|---|---|
| 1 | 5-10, rising | 0 | Authentication passing |
| 2 | 15-20 | 0 | No spam placement in tests |
| 3 | 20-30 | 5-10 to best-fit verified contacts | Bounces < 2%, replies arriving |
| 4 | 20-30 | 15-20 | Bounces < 2%, complaints ~0 |
| 5 | 20-30 | 25-30 | Placement in inbox |
| 6+ | Keep 10-20 running | 30-40 | Weekly checks stay green |
Warm-up means real, two-way conversations with engaged inboxes. Keep a low level running while cold sending continues.
4. Gate every step
Never move up a week if bounces exceed 2%, any spam complaint arrives, or placement tests show spam. Hold the current level for another week instead.
5. Plan the capacity curve
Show when the team reaches full volume. Usually week 6. If the campaign must start sooner, start with fewer, better contacts rather than more volume.
What good looks like
- First cold sends go to the cleanest, best-fit contacts, which builds reputation from real replies.
- The plan includes spare mailboxes and a resting rotation.
- The common mistake is buying ten domains on Monday and sending 50 a day from each by Friday.
Rules
- MUST wait at least two weeks of warm-up before any cold sends.
- MUST gate each ramp step on bounce, complaint and placement checks.
- NEVER use domains that imitate another company’s brand.
- NEVER exceed 50 cold emails per mailbox per day.
Example prompts
- "We want to send 500 cold emails a day starting next month. Plan the domains, mailboxes and warm-up."
- "I just set up 3 new mailboxes. Give me a week-by-week ramp."
- "Our new domain got 4% bounces in week 3. What now?"
Try it
Ask your agent like this
Once the skill is installed, plain requests like these load it automatically. Swap in your own company, buyer and numbers.
-
“We want to send 500 cold emails a day starting next month. Plan the domains, mailboxes and warm-up.”
-
“I just set up 3 new mailboxes. Give me a week-by-week ramp.”
-
“Our new domain got 4% bounces in week 3. What now?”
What does the Domain warm-up plan skill do?
Use this before sending any cold email from new domains or mailboxes. New senders have no reputation; ramping too fast is the most common way to burn a domain in its first month. You get: setup checklist, week-by-week ramp, health gates, capacity forecast.
When should I use the domain warm-up plan skill?
Use it when you set up new domains or mailboxes for cold email and need a warm-up plan.
How do I install Domain warm-up plan in Claude Code?
Run /plugin marketplace add prosyo-ai/gtm-skill and then /plugin install gtm-skills@prosyo to add the whole library, or run npx skills add prosyo-ai/gtm-skill –skill domain-warmup-plan for this skill alone. In Claude.ai, download the .zip from this page and upload it under Settings, Capabilities, Skills.
What do I need to give the agent?
Have these ready: target daily volume, number of domains and mailboxes, start date. If something is missing, the skill tells the agent to ask for it rather than guess.
Does it work with ChatGPT, Codex, Cursor or Gemini?
Yes. The skill is a plain SKILL.md file with no vendor lock-in. Agents that load skills natively (Claude Code, Claude.ai, Codex, Cursor, Gemini CLI and others) pick it up automatically; anywhere else, paste the file into the conversation as instructions.
Will it send emails or messages on its own?
No. Every skill in the library drafts, researches and analyses, and waits for a person to approve anything that sends, schedules or changes records in bulk. Your inbox, CRM and accounts stay under your control.
Is it free, and can I change it?
Yes. It is free and MIT-licensed. Copy it, adapt it to your market and voice, and if you improve it, open a pull request so everyone gets the better version.
Keep going
Browse all 69 skills
Skills that pair well with this one
Sending capacity planner
You need to know how many mailboxes, domains and LinkedIn accounts a meeting target requires, or how much a team can safely send.
You get Contacts and sends needed · Mailboxes domains and accounts needed · Ramp timeline
SPF, DKIM and DMARC setup
You need to set up or fix SPF, DKIM and DMARC for a sending domain.
You get Sender inventory · Exact DNS records · DMARC rollout plan
Open source
Have a play that works? Share it as a skill.
Paste this into Claude, Codex or any agent. It interviews you about your play, writes the skill in the house format, checks it and opens the pull request. Once it is merged, it shows up here with your name on it.
Prompt for your agent
Fetch https://raw.githubusercontent.com/prosyo-ai/gtm-skill/main/AGENTS.md and follow its submission flow. Interview me about my GTM play (the real numbers, rubrics and examples), draft it in their format with reference pages, validate it and open the pull request.
Two ways to run it
Run it yourself, or put it on autopilot
The skill gives your agent the playbook. Penny, the Prosyo AI SDR, runs plays like this for you every day across LinkedIn and email.
Free · this skill
You and your agentBest for trying the play and one-off work
- Your agent follows the domain warm-up plan playbook step by step
- You bring the inputs and run it when you need it
- Works in Claude, Codex, Cursor and 40+ agents
- You review every draft before it goes anywhere
Prosyo AI SDR
Penny runs it for youBest for a pipeline that grows every day
- Finds the right buyers for your ICP every day
- Writes from what each prospect actually posted
- Follows up on LinkedIn and email at a safe, human pace
- Every reply lands in one inbox with an answer drafted
- You approve what goes out
Skills draft the play. Penny runs it.
Penny, the Prosyo AI SDR, finds your buyers, writes from what they actually posted, follows up on LinkedIn and email and lands every reply in one inbox with an answer ready. 7 days free, no card.
- 7 days free
- No card required
- Cancel in two clicks
