pin this page. come back to it every time you spin up new domains or troubleshoot deliverability issues.
| Element | Target | Red Flag |
|---|---|---|
| Domain age before sending | 14+ days | Sending from domains less than 7 days old |
| Warmup period | 14 days minimum | Skipping warmup entirely |
| Campaign emails per inbox/day | 25-40 | Over 50 per inbox per day |
| Warmup emails per inbox/day | 30-50 | Turning warmup off during campaigns |
| Provider split | 70/30 or 50/50 | 100% on a single provider |
| Bounce rate | Below 3% | Above 5% |
| Inboxes per campaign | 10-15 minimum | Blasting from 1-2 inboxes |
| SPF/DKIM/DMARC | All passing | Any one missing or failing |
| Sending window | 6-8 hours, business hours | All emails sent in a 30-min burst |
tick these off for every domain before it touches a campaign:
| Mistake | Fix |
|---|---|
| Sending from primary domain | Buy lookalike domains. Keep primary for warm comms only. |
| No DNS configuration at all | Set up SPF, DKIM, DMARC on EVERY sending domain. Non-negotiable. |
| Skipping warmup | 14 days minimum. Keep warmup running alongside campaigns. |
| All volume through one provider | Split between Google and Microsoft (70/30 or 50/50). |
| Blasting 200+ emails from a single inbox | Spread across 10-15 inboxes. 25-40 campaign emails per inbox per day. |
| Turning warmup off when campaigns start | Keep warmup running. It maintains your reputation. |
| Replacing domains every 2-3 weeks | Fix the root cause (usually one of the above). Properly set-up domains last 6+ months. |