Email Warmup
Email warmup is the process of gradually increasing email sending volume on a new or dormant domain or IP address over a period of weeks, allowing mailbox providers to evaluate the sender’s behavior and establish a positive sender reputation before full-volume sending begins.
Why Warmup Is Necessary
New domains and IP addresses have no sending history — no sender reputation. Mailbox providers treat unknown senders with suspicion. Sending a large volume from an unknown sender triggers spam filters and can result in immediate blocking.
Warmup solves this by:
- Establishing a track record of legitimate sending
- Building positive engagement signals gradually
- Allowing mailbox providers to classify you as a trusted sender
- Preventing the reputation damage that comes from hitting filters at high volume
1. Week 1: Send 50–100 emails per day to most engaged recipients only. 2. Week 2: Increase to 200–500 per day, expanding to recent openers and clickers. 3. Week 3: Ramp to 1,000–2,000 per day with broader engaged segments. 4. Week 4: Scale to 5,000–10,000 per day with continuous monitoring. 5. Week 5+: Reach full target volume while monitoring placement and complaints. 6. Danger zone: ramping too fast triggers spam filters and damages the reputation being built.
A Typical Warmup Schedule
| Week | Daily Volume | Strategy |
|---|---|---|
| 1 | 50–100 | Send to your most engaged recipients only |
| 2 | 200–500 | Expand to recent openers and clickers |
| 3 | 1,000–2,000 | Include broader engaged segments |
| 4 | 5,000–10,000 | Continue expanding with monitoring |
| 5+ | Full volume | Ramp to target volume while monitoring metrics |
The exact schedule depends on your target volume and the mailbox providers you’re targeting.
Signs Warmup Is Working
- Consistent inbox placement above 90%
- Stable or improving open rates
- Spam complaint rates below 0.1%
- No blocklist appearances
- Positive domain reputation in Google Postmaster Tools
How InboxAlly Helps
InboxAlly accelerates warmup by providing seed emails that generate positive engagement signals from day one. Instead of relying solely on organic engagement from a small initial audience, InboxAlly’s network ensures consistent opens and reads across major mailbox providers — giving your new domain or IP the behavioral data it needs to build sender reputation faster.