Doc Summary
TABLE OF CONTENTS
- What is Domain Warmup?
- What Warmup Model Is Used?
- Warmup Stage Breakdown
- When Does Warmup Start?
- For newly created domains:
- For existing domains:
- How to Start Warmup for an Existing Domain:
- Who Can Use Email Warmup and How to Enable It
- Google Postmaster Integration (Recommended)
- Best Practices for a Successful Warmup
- When Is Warmup Complete?
What is Domain Warmup? #
Domain warmup is the process of gradually increasing your daily email volume to build a trusted sender reputation with inbox providers like Gmail, Outlook, and Yahoo.
Without proper warmup, new domains are more likely to:
- Be flagged as spam
- Experience high bounce or complaint rates
- Face email delivery blocks or delays
We automates this process to help you build trust and maximize email deliverability.
What Warmup Model Is Used? #
This system uses a fixed-stage, gradual warmup model, which means:
- Each stage has a predefined daily sending limit
- Progression only occurs when the full daily limit for the current stage is reached
- If the daily limit is not met, the domain remains in the same stage
- There are no hourly sending limits
- You must send emails through the warming domain for progress to be tracked
Important: Sending beyond the daily limit is allowed and emails will not be blocked.
Warmup Stage Breakdown #
| Stage | Daily Limit |
|---|---|
| 1 | 1,000 |
| 2 | 2,500 |
| 3 | 5,000 |
| 4 | 6,500 |
| 5 | 8,000 |
| 6 | 10,000 |
| 7 | 14,000 |
| 8 | 20,000 |
| 9 | 25,000 |
| 10 | 35,000 |
| 11 | 50,000 |
| 12 | 80,000 |
| 13 | 125,000 |
| 14 | 175,000 |
| 15 | 250,000 |
Once the daily limit is reached, the system pauses additional sending from that domain until 12:00 AM UTC the next day. The next stage will automatically begin if the full daily limit was reached.
When Does Warmup Start? #
For newly created domains: #
Warmup is automatically enabled when the domain is created and verified. No manual action is needed.
For existing domains: #
Warmup must be enabled manually. When you enable warmup on an existing domain, the system will automatically analyze:
- Past email activity
- Google Postmaster reputation data (if integrated)
Based on this, it will recommend the most suitable starting stage to ensure smooth warmup progression.
How to Start Warmup for an Existing Domain: #
- Navigate to the domain in your Email Setup screen
- Click Start Warmup
- Begin sending emails using that domain
Sending activity is required for the system to track warmup progress.
Who Can Use Email Warmup and How to Enable It #
Email warmup is available for both agencies and sub-accounts using dedicated domains.
To enable warmup for an agency domain:
- Go to Agency Settings
- Click Email Services
- Select SMTP Service
- Go to the Dedicated Domain and IP tab
- Choose your domain and click Start Warmup
To enable warmup for a sub-account domain:
- Go to the Sub-Account Settings
- Click Email Services
- Select SMTP Service
- Go to the Dedicated Domain and IP tab
- Choose your domain and click Start Warmup
Google Postmaster Integration (Recommended) #
Integrating your domain with Google Postmaster Tools gives you access to key deliverability data, including:
- Domain reputation (High, Medium, Low, Bad)
- Spam complaint rates
- Authentication status
- Delivery and error metrics
If Google Postmaster is not yet connected or no data is available, the domain dashboard will notify you and guide you through setup.
Best Practices for a Successful Warmup #
- Send emails consistently every day
- Use verified, opt-in contact lists
- Avoid sudden spikes in volume
- Avoid switching sender domains mid-campaign
- Respect daily warmup limits to avoid future enforcement blocks
When Is Warmup Complete? #
Your domain completes warmup when it reaches Stage 15 (250,000 emails/day). At that point, you will see a “Warmup Complete” label in the domain dashboard, and full-scale sending will be supported.
