On the Warming page, click "Enable Warming," select the mailboxes to warm, pick your daily volume (up to 20/day) and a ramp speed (Slow, Normal, or Fast), and confirm. Warming starts immediately. Cost is $0.60/mailbox/month, added to your next invoice. You can pause or disable any time from the mailbox row.
Choosing volume and ramp speed
Warming has a single component — warmup email, capped at 20/day. There's no separate "cold" volume inside warming; your real cold campaigns run separately through your sending tool. You set two things:
- Daily volume — how many warmup emails/day the mailbox works up to. Default and max is 20. Lower it (say 5-10) for a brand-new domain you want to treat gently.
- Ramp speed — how fast it climbs to that cap:
Slow — slowest ramp. Best for brand-new domains under 30 days old. Lowest risk of triggering filters, takes the longest to reach full capacity.
Normal — the default. Fine for most new domains, especially with some baseline confidence (aged 30+ days, .com TLD, connected redirects).
Fast — fastest ramp. For domains you know are safe — aged 60+ days, established DNS, no prior blacklisting.
If unsure, leave volume at 20 and pick Normal. You can adjust later.
What starts happening after you enable
Immediately: - The mailbox is registered with Winnr's warming network. - First warming emails go out within 15-60 minutes. - Metrics start populating.
Within 24 hours: - 5-15 warming emails sent, similar volume received. - Health score begins forming (may still show as "New" until enough data is collected).
Within a week: - Health score reflects real reputation signals. - Inbox rate (% of warming emails hitting inbox vs spam) is meaningful. - You can start layering in real cold email at low volume if you want.
Within 2-3 weeks: - Full warming volume reached. - Health score stabilizes. - Ready for full campaign sending.
What's next
Step-by-step
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1. Open the Warming page
App sidebar → Warming. If you haven't enabled warming for any mailboxes yet, you'll see a splash screen with a "Start Warming" button.
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2. Click Enable Warming
A dialog opens listing your mailboxes. Check the ones you want to warm — usually every new mailbox.
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3. Pick volume and ramp speed
Set daily volume (up to 20 warmup emails/day, 20 is the default and the max) and a ramp speed. Slow — slowest ramp, best for brand-new domains. Normal — the default, works for most setups. Fast — fastest ramp, for aged domains where you're confident.
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4. Review the cost
Winnr shows the total warming cost for the selected mailboxes ($0.60 × count × month). Confirm.
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5. Watch the metrics
Warming begins immediately. Metrics start showing within a few hours — first useful signal (health score, inbox rate) around day 3-5. Full readiness by end of week 2 or 3.
Frequently asked questions
Can I enable warming across many mailboxes at once?
Yes — the enable dialog is a multi-select. Or use bulk actions from the Email Users page — filter by domain, select all rows, Bulk Actions → Enable Warming.
Does warming send from my mailbox to real recipients?
No — warming emails are exchanged within Winnr's warming network. Real cold email campaigns are separate; you send those through your regular sending tool.
How is warming billed?
$0.60 per active mailbox per month. Billed on your regular Winnr invoice. Prorated for partial months. Turning warming off stops the charge from the next billing cycle.
Can I warm a mailbox on an external Gmail or Outlook account?
Yes — Winnr can warm SMTP accounts you own outside Winnr. See [Import external accounts for warming](/help/warming/import-external.html).
How long does warming need to run?
2-3 weeks minimum for a new mailbox on a new domain. 1-2 weeks for a new mailbox on an aged domain. Some customers keep warming on indefinitely at low volume as a reputation maintenance signal — that's fine but not required.