New Domain Warmup Plan: The 30-Day Schedule That Actually Works
A day-by-day warmup plan for new domains. Learn exactly how many emails to send each day, which metrics to watch, and when to increase volume.
Why New Domains Need a Warmup
When you register a new domain or set up a new sending IP, mailbox providers like Gmail, Outlook, and Yahoo have no history for you. No history means no trust. And no trust means your emails go to spam — or get silently dropped.
A warmup is the process of gradually increasing your sending volume while building a positive engagement history. Think of it like building a credit score: you can't take out a large loan on day one. You need to prove reliability over time.
Minimum warmup period for a new domain to build baseline reputation
The 30-Day Warmup Schedule
This schedule assumes you have proper authentication in place (SPF, DKIM, DMARC) before you send a single email.
Stop — Check Your DNS Before Day 1
If your SPF, DKIM, or DMARC records are missing or misconfigured, every email in this schedule will fail authentication and build negative reputation instead of positive. This is not a minor detail — it makes warmup counterproductive. Run a free IHS scan to verify your Config score is 80+ before you start. Warmup on broken DNS is wasted money and burned domains.
Rules for Increasing Volume
Never increase volume blindly based on the calendar. Each step up should only happen when these conditions are met:
- Bounce rate stays below 2% — Hard bounces above this signal a dirty list
- Spam complaint rate stays below 0.05% — Even one spike can set you back
- Open rates are consistent or improving — Declining opens suggest spam placement
- No throttling from providers — If Gmail starts deferring, hold volume steady
Pro Tip from Boxset Team
Send your warmup emails during business hours (9 AM - 2 PM recipient local time). Engagement rates are higher, which builds reputation faster.
What to Send During Warmup
Content matters as much as volume during warmup. The goal is to maximize positive engagement signals.
Best warmup content:
- Transactional emails (order confirmations, account alerts) — highest open rates
- Welcome emails to brand-new subscribers — they expect to hear from you
- Personalized content to known engagers — they'll open and click
Avoid during warmup:
- Cold outreach to purchased lists
- Re-engagement campaigns to dormant subscribers
- Promotional blasts with aggressive subject lines
Warning Signs to Watch
If you see any of these signals, stop increasing volume and hold at the current level for 3-5 additional days:
- Open rate drops by more than 15% compared to previous days
- Bounce rate spikes above 3%
- Emails start landing in Gmail's Promotions tab when they previously hit Primary
- You receive deferrals or temporary rejections from major providers
After the Warmup
Once you've completed the 30-day warmup and are sending at your target volume with healthy metrics, the work isn't over. Maintain your reputation by:
- Segmenting by engagement — don't email people who haven't opened in 90+ days
- Maintaining consistent sending volume — sudden spikes trigger filters
- Monitoring Google Postmaster Tools weekly for reputation changes
Read the complete warmup guide →
Frequently Asked Questions
Start Intelligent Warmup
Boxset's AI warmup engine adapts in real-time to mailbox provider responses. No rigid schedules — just intelligent, adaptive sending that builds reputation faster.
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