Email Warmup Simulator
See how email domain reputation builds over time with gradual sending
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Warmup Parameters
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30-Day Warmup Timeline
D1
30
D2
50
D3
70
D4
90
D5
110
D6
130
D7
150
D8
170
D9
190
D10
200
D11
200
D12
200
D13
200
D14
200
D15
200
D16
200
D17
200
D18
200
D19
200
D20
200
D21
200
D22
200
D23
200
D24
200
D25
200
D26
200
D27
200
D28
200
D29
200
D30
200
Week-by-Week Breakdown
Week 1
Day 1-7
Avg Daily
90 emails
Reputation
58%
Open Rate
37.2%
warm
Week 2
Day 8-14
Avg Daily
194 emails
Reputation
90%
Open Rate
50%
hot
Week 3
Day 15-21
Avg Daily
200 emails
Reputation
100%
Open Rate
50%
hot
Week 4
Day 22-28
Avg Daily
200 emails
Reputation
100%
Open Rate
50%
hot
Why Email Warmup is Critical
Protect Reputation
Sending too many emails from a new domain lands you in spam. Gradual sending builds ISP trust.
Increase Deliverability
Higher open rates and engagement signals from warmup improve inbox placement on real campaigns.
Avoid Spam Folder
Skip warmup = highest likelihood of landing in spam and damaging your sender reputation permanently.
The Complete Email Warmup Schedule (Week by Week)
Email warmup is not optional — it is the foundation of every successful cold email campaign. Skipping it means landing in spam from day one and permanently damaging your domain reputation. New Gmail and Outlook domains need 4-6 weeks of warmup. Aged domains (1+ year, previously active) typically need 2-3 weeks. Here is the exact week-by-week schedule that works.
Week
Period
Volume
Per Day
Reply Target
Rate
Bounce Max
Rate
Domain
Status
Week 1
10–20
30%+
< 2%
Cold
Week 2
20–40
25%+
< 2%
Warming
Week 3
40–70
20%+
< 2%
Warm
Week 4
70–100
15%+
< 2%
Warm
Week 5-6
100–150
10%+
< 2%
Ready
Key Warmup Rules
- →Never exceed 50% of the previous week's volume in a single jump
- →Maintain positive engagement — replies matter more than sends
- →Spam complaint rate must stay under 0.1% at all times
- →Use a real seed list (actual inboxes that open and reply), not bots
- →New domains need 4-6 weeks; aged domains (1+ year) need 2-3 weeks
Frequently Asked Questions
What is email warmup and why is it important?
Email warmup is the process of gradually increasing the volume of emails sent from a new or inactive domain to build a positive sending reputation with ISPs (Internet Service Providers) like Google and Microsoft. When a domain suddenly starts sending hundreds of emails per day, spam filters flag it as suspicious — regardless of the content quality. A proper warmup signals to ISPs that this is a legitimate sender with normal patterns, which results in inbox placement instead of spam folder delivery.
How long does email warmup take?
For brand new domains: 4-6 weeks. For domains that have been active before but have been dormant: 2-3 weeks. For domains with existing positive reputation (regular sent and received email): 1-2 weeks of light warmup before increasing volume. The warmup period is not negotiable — trying to skip or compress it results in deliverability issues that can take months to recover from. Use automated warmup tools (Instantly, Mailreach, Warmbox) to simplify the process.
How many emails can I send per day after warmup?
After a full warmup, most professionals safely send 50-150 cold emails per day per account. Many run multiple accounts across multiple domains simultaneously to scale volume while keeping per-account sends in the safe zone. Google Workspace accounts have a 2,000 daily send limit, but deliverability degrades well before that. For serious cold email campaigns, having 3-5 sending domains (each sending 50-100 emails/day) gives you 150-500 outreach emails daily with minimal risk.
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