A cold email warmup schedule ramps new inboxes from 3-5 sends on day 1 to full cold volume (10-20 cold/day) over 4-6 weeks. Aggressive and normal plans reach full volume on day 28; safe plans take 42 days. Warmup runs alongside — 20-35 warmup emails/day — so your inbox's profile looks natural to spam filters. Skipping warmup burns the inbox in 2-4 weeks.
Warmup Schedule Generator
| Day | Date | Cold emails / inbox | Warmup / inbox | Total / inbox | Total across fleet |
|---|
Warmup volume runs inside the same daily budget as cold sends. Winnr's built-in warming respects these caps automatically.
Why Warmup Matters
Every cold email inbox starts with zero reputation. Spam filters (Gmail, Outlook, Yahoo) track sender patterns over time: how much you send, to whom, how recipients interact with your mail, what your reply rate looks like, whether your traffic pattern resembles a human's outbox. A brand-new inbox that sends 15 cold emails on day 1 looks exactly like a spammer — and gets filtered accordingly.
Warmup solves this by simulating natural email behavior. The inbox sends and receives messages inside a warming network (other trusted inboxes that reply, mark as important, move out of spam). Over 4-6 weeks, this builds a reputation score that lets you scale cold volume without tripping filters.
Why the Logistic Curve?
The schedule above uses a logistic (S-shaped) ramp rather than a linear one. Linear warmup plans (+1 email per day) are what most free tools use — and they under-warm in weeks 1-2 and over-warm in weeks 3-4. The logistic curve is slow at the start (protects reputation when it's most fragile), fastest in the middle (once early trust is established), and slow at the finish (lets you settle into sustainable volume without overshooting).
Concretely, a normal-pace logistic ramp to 15 cold/day looks like:
- Day 1-3: 3-5 cold/day (reputation-building phase)
- Day 7: ~7 cold/day (roughly half of target)
- Day 14: ~13 cold/day (nearly full volume)
- Day 28: 15 cold/day (steady state)
Running Warmup at Scale
Most cold email teams don't warm one inbox at a time — they warm 50-200 at once so the fleet hits full volume simultaneously. The generator's fleet-size field does the math for you. For 50 inboxes on normal pace:
- Day 1 fleet: 50 × 5 = 250 cold sends total
- Day 14 fleet: 50 × 13 = 650 cold sends total
- Day 28 fleet: 50 × 15 = 750 cold sends/day (steady state)
Warmup traffic for 50 inboxes on normal pace peaks at 50 × 35 = 1,750 warmup sends/day. Winnr's built-in warmup handles this automatically — no per-inbox configuration.
Paired with: Use the inbox calculator to size your fleet before generating the schedule. Before warmup starts, set up DNS with the SPF, DKIM, and DMARC generators.
Frequently Asked Questions
How long should I warm up a cold email inbox?
4 weeks (28 days) for aggressive and normal plans, 6 weeks (42 days) for safe. Skipping ahead dramatically shortens inbox life.
How many cold emails on day 1?
3-5. Going higher is the single most common way to burn a fresh inbox.
Aggressive vs normal vs safe?
Aggressive: 28d to 20 cold + 30 warm. Normal: 28d to 15 cold + 35 warm. Safe: 42d to 10 cold + 20 warm.
Do I keep warmup running after ramp?
Yes, indefinitely. Warmup maintains reputation by keeping send patterns looking natural. Winnr's built-in warming runs continuously at $0.60/inbox/month.
Can I warm multiple inboxes in parallel?
Yes. Every inbox uses the same schedule independently. Provision all at once, enable warming, they all hit full volume together.
What if I skip warmup?
The inbox burns in 2-4 weeks. Warmup isn't optional — it's how you buy reputation before you need it.
Does Winnr include warmup?
Yes. $0.60/inbox/month on Winnr's own warming network. One-click enable.