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Email Warmup Calculator

Calculate an optimal email warmup schedule for new domains or IPs. Get a day-by-day sending plan to build sender reputation without triggering spam filters.

Email Warmup Calculator

Plan your email warmup schedule for new domains or IPs

Emails per day after warmup

30% daily increase - balanced approach

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13

Days to target

50

Starting volume

51,717

Total during warmup

Warmup Schedule

DayDaily EmailsProgressCumulative
Day 150
50
Day 265
115
Day 385
200
Day 4110
310
Day 5143
453
Day 6186
639
Day 7241
880
Day 8314
1,194
Day 9408
1,602
Day 10530
2,132
Day 11689
2,821
Day 12896
3,717
Day 13
Target reached
1,000
4,717
Day 141,000
5,717
Day 151,000
6,717
Day 161,000
7,717
Day 171,000
8,717
Day 181,000
9,717
Day 191,000
10,717
Day 201,000
11,717
Day 211,000
12,717
Day 221,000
13,717
Day 231,000
14,717
Day 241,000
15,717
Day 251,000
16,717
Day 261,000
17,717
Day 271,000
18,717
Day 281,000
19,717
Day 291,000
20,717
Day 301,000
21,717

Showing first 30 days. Download CSV for full schedule.

Warmup Best Practices

  • • Send to engaged subscribers first (recent openers)
  • • Monitor bounce rates daily - pause if > 2%
  • • Check spam folder placement with seed lists
  • • Avoid cold outreach during warmup period
  • • Maintain consistent sending times each day

Why warmup?

  • New IPs/domains have no sending reputation
  • ISPs flag sudden high volume as spam behavior
  • Gradual increase builds trust with email providers
  • Rushing warmup can permanently damage deliverability

About this tool

Email warmup is critical when starting with a new domain or IP address. This calculator creates a day-by-day plan to gradually increase sending volume while monitoring for issues. Before starting warmup, ensure your domain has proper SPF, DKIM, and DMARC authentication configured. As you execute your warmup plan, monitor your sender reputation and check for blacklist listings. Use campaign metrics to track bounce rates during the warmup period.

Frequently Asked Questions

Email warmup is the process of gradually increasing sending volume from a new domain or IP address. This builds sender reputation with ISPs and prevents your emails from being flagged as spam.

Typically 4-8 weeks depending on your target volume. Start with 20-50 emails per day and gradually increase. Rushing this process will damage your sender reputation.

Send to your most engaged subscribers first - those who regularly open and click. Their positive engagement signals to ISPs that your emails are wanted. Avoid cold outreach during warmup.

Monitor your inbox placement rate, open rates, and bounce rates. Good signs: >95% delivery rate, consistent open rates, minimal spam complaints. Bad signs: increasing bounces or spam folder placement.

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