Warming up is the process of gradually increasing volume so mailbox providers learn that your mail is wanted. If you jump from 0 to high volume overnight, you are more likely to see throttling, spam placement, or blocks.
How to use this
- Start with your expected steady-state daily volume.
- Use the schedule as a baseline, then adapt it to your real engagement and bounce/complaint rates.
- If you see provider throttling (e.g.
421 4.7.x), slow down and smooth the ramp.
What good looks like
- Low hard bounces (invalid recipients)
- Low complaints
- Stable open/click rates for engaged recipients
Related docs:
Warmup Calculator
Generate a simple geometric ramp. Tune it with your real-world signals.
| Day | Volume | Progress |
|---|---|---|
| 1 | 200 | |
| 2 | 285 | |
| 3 | 406 | |
| 4 | 579 | |
| 5 | 825 | |
| 6 | 1,176 | |
| 7 | 1,675 | |
| 8 | 2,388 | |
| 9 | 3,403 | |
| 10 | 4,849 | |
| 11 | 6,910 | |
| 12 | 9,848 | |
| 13 | 14,034 | |
| 14 | 20,000 |
Note: warmup is not just volume. Monitor bounces/deferrals/complaints and slow down when providers push back.