Individual skill
cold-email-inbox-warmup
Use this skill when new sending domains or mailboxes need warming before a cold email campaign: fresh domains, new inboxes on an existing domain, or mailboxes recovering from spam-folder placement. Produces a ramp schedule and a go/no-go check before real volume starts.
skills/imad-badreddine/cold-email-inbox-warmup/SKILL.md
Source commit 5d786aad0c7b2ca59b1abf1f601f9407ca261996
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- Yes
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- Observed behavior
- Instructions only
- Last checked
- Nov 11, 2026
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- Repository stars (not skill ratings)
- 237
- Repository last updated
- Oct 20, 2026
- License
- MIT
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SKILL.mdcore · 2,863 bytes
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Run this before any new domain or mailbox sends cold email. It produces a ramp schedule and a clear go/no-go decision for opening campaign volume.
## The play
1. Separate the asset from the brand: cold email runs on secondary domains, never the company's primary domain. The primary's reputation is not a chip to gamble.
2. Give a fresh domain two weeks of silence after setup: authentication configured, mailboxes created, signatures and profile pictures in place, zero cold sends. Age is part of reputation.
3. Warm for at least three weeks before campaign volume: start at a handful of sends per day per mailbox, grow the daily count a little every few days, and keep replies flowing; a mailbox that only sends and never receives looks like a cannon, not a person.
4. Cap real campaign volume per mailbox at 20-30 cold sends per day, and keep warm-up activity running in the background even after campaigns start. Scale by adding mailboxes and domains, not by pushing one inbox harder.
5. Go/no-go before launch: spot-check where warm-up messages land. Anything worse than consistent inbox placement means the ramp continues; launching into the spam folder burns the list and the domain together.
6. On a placement drop or a bounce spike mid-campaign: cut volume in half, hold for several days, and only ramp back one step at a time: the same discipline as the initial warm-up, at smaller scale.
## What good looks like
- Good operators treat sending volume as something a mailbox earns, week by week; the mediocre version buys a domain on Monday and blasts 200 sends on Friday, then wonders why replies stopped.