Step 1
Enter your starting and target volume
Tell the calculator your current daily send (often 0-50 for a new domain) and the daily volume you ultimately need to send.
Free Email Warmup Plan Calculator
An email warmup plan is a gradual schedule for increasing send volume from a new domain or IP to build sender reputation with mailbox providers. This free calculator generates a day-by-day ramp plan based on your starting volume, target volume, and timeline.
Allowed range: 14-90 days.
Ramp curve
Send days per week
Sender type
Total emails
20,790
Send days
21 / 30
Reaches target
May 29, 2026
Curve
Moderate
Day-by-day schedule
Starts today. Off days are skipped per your weekly send schedule.
| Day | Date | Weekday | Daily target | Cumulative | % of target |
|---|---|---|---|---|---|
| 1 | 2026-05-01 | Friday | 20 | 20 | 0% |
| 2 | 2026-05-02 | Saturday | off | 20 | - |
| 3 | 2026-05-03 | Sunday | off | 20 | - |
| 4 | 2026-05-04 | Monday | 25 | 45 | 1% |
| 5 | 2026-05-05 | Tuesday | 35 | 80 | 1% |
| 6 | 2026-05-06 | Wednesday | 45 | 125 | 1% |
| 7 | 2026-05-07 | Thursday | 60 | 185 | 1% |
| 8 | 2026-05-08 | Friday | 80 | 265 | 2% |
| 9 | 2026-05-09 | Saturday | off | 265 | - |
| 10 | 2026-05-10 | Sunday | off | 265 | - |
| 11 | 2026-05-11 | Monday | 100 | 365 | 2% |
| 12 | 2026-05-12 | Tuesday | 150 | 515 | 3% |
| 13 | 2026-05-13 | Wednesday | 175 | 690 | 4% |
| 14 | 2026-05-14 | Thursday | 250 | 940 | 5% |
| 15 | 2026-05-15 | Friday | 325 | 1,265 | 7% |
| 16 | 2026-05-16 | Saturday | off | 1,265 | - |
| 17 | 2026-05-17 | Sunday | off | 1,265 | - |
| 18 | 2026-05-18 | Monday | 425 | 1,690 | 9% |
| 19 | 2026-05-19 | Tuesday | 500 | 2,190 | 10% |
| 20 | 2026-05-20 | Wednesday | 700 | 2,890 | 14% |
| 21 | 2026-05-21 | Thursday | 1,000 | 3,890 | 20% |
| 22 | 2026-05-22 | Friday | 1,300 | 5,190 | 26% |
| 23 | 2026-05-23 | Saturday | off | 5,190 | - |
| 24 | 2026-05-24 | Sunday | off | 5,190 | - |
| 25 | 2026-05-25 | Monday | 1,700 | 6,890 | 34% |
| 26 | 2026-05-26 | Tuesday | 2,200 | 9,090 | 44% |
| 27 | 2026-05-27 | Wednesday | 2,900 | 11,990 | 58% |
| 28 | 2026-05-28 | Thursday | 3,800 | 15,790 | 76% |
| 29 | 2026-05-29 | Friday | 5,000 | 20,790 | 100% |
| 30 | 2026-05-30 | Saturday | off | 20,790 | - |
Metrics to monitor each day
Hard bounce rate
< 2%Above 2% suggests list quality issues. Pause increases and clean the list.
Spam complaint rate
< 0.1%Gmail Postmaster flags rates above 0.3%. Review content and consent.
Open rate (engaged segment)
> 20%Healthy opens drive positive reputation signals during warmup.
Deferral / 4xx rate
< 5%Frequent 4xx codes from Gmail or Outlook indicate provider throttling.
Postmaster reputation
HighWatch domain and IP reputation in Google Postmaster Tools.
Authentication pass rate
100%SPF, DKIM, DMARC must all pass on every send.
Plan covers 21 send days over 30 calendar days. Total 20,790 emails. Reaches target on May 29, 2026.
How it works
Step 2
Pick a duration and ramp curve
Choose how many days you have for the warmup (30 is a common default) and a curve: Conservative, Moderate, or Aggressive.
Step 3
Choose send days and sender type
Select 5/6/7 send days per week and whether this is a new domain, new IP, or re-engagement of a cold list.
Before you start: pre-warmup checklist
SPF record
Authorize the IPs that will send mail for the domain.
SPF Record Checker ->DKIM signing
Publish a DKIM selector with a 1024-bit or 2048-bit key, then sign every send.
DKIM Checker ->DMARC policy
Start with p=none and an rua= reporting address; tighten to quarantine after 2-4 weeks.
DMARC Record Generator ->Content hygiene
Run draft templates through the spam score checker before warmup begins.
Email Spam Score Checker ->List hygiene
Remove duplicates and obvious typos before any send. Keep the list small and engaged.
Email List Deduplicator ->Blacklist status
Confirm the sending IP and domain are not already listed on any major DNSBL.
Email Blacklist Checker ->Frequently Asked Questions
What is email warmup and why does it matter?
Email warmup is the practice of gradually increasing send volume from a new domain or IP so mailbox providers (Gmail, Outlook, Yahoo) can build a positive reputation for the sender. Without warmup, sudden bursts of volume look like spam and trigger filtering, throttling, or outright blocks. A proper warmup establishes a baseline of engaged opens and clicks that protects your future deliverability.
How long should email warmup take?
Most new domains and IPs need 4-6 weeks (28-45 days) of warmup before reaching full target volume. Conservative ramps for high-volume senders (>100k/day) can extend to 8 weeks. Re-engagement of cold lists from a warm domain is usually faster, around 14-21 days, because reputation is already established.
What is a safe daily send increase during warmup?
A common rule of thumb is to no more than double daily volume each day in the first week and then increase by 30-50% per day thereafter, capped by a target. For new IPs at high volume, increases of 20-30% per day are safer. Always watch bounce rates and complaint rates: if either rises, pause increases for 1-2 days before continuing.
Should I warm up a new domain or a new IP differently?
Yes. New domains require building reputation across mailbox providers and benefit from sending only to highly engaged recipients first (employees, opt-ins). New IPs need warmup if you are leaving a shared pool for a dedicated IP, and the ramp focuses on volume per provider. If you are doing both at once, ramp more conservatively: each provider must learn both the domain identity and the IP simultaneously.
What metrics should I monitor during warmup?
Watch hard bounce rate (keep under 2%), spam complaint rate (keep under 0.1%), open rate (aim for >20% on engaged segments), deferral rate (4xx codes from Gmail/Outlook indicate throttling), and Google Postmaster Tools reputation (aim for High). If any metric degrades, stop increasing and hold volume flat for 2-3 days.
Can I skip warmup if I already have SPF, DKIM, and DMARC set up?
No. Authentication is necessary but not sufficient. SPF, DKIM, and DMARC prove who is sending the mail, but mailbox providers also need engagement history to decide whether the inbox or spam folder is appropriate. Warmup builds that engagement history. Always set up SPF, DKIM, and DMARC before starting warmup, not as a substitute for it.
Related Tools
SPF Record Checker
Validate SPF syntax, lookup count, and surface common record mistakes before you start warming up.
DKIM Checker
Look up DKIM selector records, validate key strength, and surface fixes for broken DKIM setups.
DMARC Record Generator
Generate ready-to-use DMARC DNS records with policy, reporting, and alignment options.
Email Spam Score Checker
Test your email content for spam triggers, ALL CAPS, and risky formatting before sending.
Email Blacklist Checker
Check if your IP or domain is listed on Spamhaus, Barracuda, SORBS, and other DNSBLs.
MX Record Lookup
Look up MX records for any domain to see which mail servers handle delivery.