Most providers report "delivered" and stop there. We instrument where mail actually lands — inbox, spam, or missing — per mailbox provider, and engineer every layer underneath it. Authentication, reputation, hygiene, and abuse control, on sending infrastructure we own.
North star: inbox-placement rate — measured, surfaced, alerted on.
Each one is a place mail goes to die at a lazy provider. We own all five.
Auto-generated DKIM keys, derived SPF and DMARC, optional custom MAIL FROM, and a tracking-domain CNAME. One-click DNS publishing on our own fleet, copy-paste records for any registrar, and live re-verification. Alignment is a gate — we warn before you send on an unverified or misaligned domain.
Dedicated IP pools for scale, pool-per-tenant or pool-per-stream, with transactional and marketing kept strictly apart. Automated warmup ramps volume per IP per day, auto-adjusting to engagement and bounce signals. A live reputation score per domain and per IP, with alerts before it slips.
Hard bounces and complaints auto-suppress, and the per-project suppression list is enforced pre-send — not after. Optional address validation checks syntax, MX, and disposable or role accounts before a message ever leaves. Search, export, and audit every suppression with a reason attached.
Seed-list tests send to accounts across major mailbox providers and report folder placement — inbox, spam, or missing — per provider. Continuous blocklist monitoring watches your IPs and domains against major RBLs, and DMARC aggregate reports are ingested and parsed so you can see exactly who's sending as you.
Signup screening with disposable-domain and risk scoring, send-pattern anomaly detection, and per-tenant caps that expand only as reputation is proven. Complaint-rate guards and a fast kill-switch keep one bad actor from poisoning the pool. On shared infrastructure this is existential — so we treat it as day-one, not later.
One-click unsubscribe per RFC 8058 with proper List-Unsubscribe headers, BIMI support once DMARC is at enforcement, and DMARC policy guidance that walks you from none to quarantine to reject. GDPR and CCPA ready, with data export and delete.
The 2024 bulk-sender rules disqualify a lot of senders. usermails meets every one before you hit send.
| Requirement | What it means | How usermails handles it |
|---|---|---|
| SPF + DKIM aligned | Both must pass and align for DMARC to authenticate the sending domain. | Keys and records generated and verified at domain setup; alignment is checked on every send. |
| DMARC published | A valid DMARC record is required for bulk senders. | DMARC derived automatically with a guided path from p=none to enforcement. |
| One-click unsubscribe | RFC 8058 — recipients must unsubscribe in a single click, honored within two days. | List-Unsubscribe and one-click headers injected for marketing streams, processed instantly. |
| Complaint rate < 0.3% | Stay under 0.3%, and never near 0.3% — aim below 0.1%. | Real-time complaint-rate guards alert and throttle before you cross the line. |
| Valid forward & reverse DNS | Sending IPs need matching PTR records and a real hostname. | Managed on our own IP space — PTR, hostname, and TLS configured for every pool. |
Targets: complaint rate under 0.1% (and always under the 0.3% hard ceiling). We surface the live number so you never find out from a deferral.
Not a reseller, not a shared third-party pool. Dedicated IPs we control end to end — which means IP reputation is something we can actually manage on your behalf.
Because we run our own IP space, we set the warmup curves, isolate tenants, and rotate pools deliberately. Your sending reputation isn't shared with thousands of unknown senders on someone else's network.
Transactional and marketing run on separate pools so a campaign can never drag down your password resets. Each stream warms and reports independently, with its own reputation score.
Observing placement and reputation signals across many tenants lets us route smarter, warm faster, and alert earlier than any single sender working alone can. Every send makes the next one more deliverable.
No black boxes. Every signal that determines placement is on the dashboard.
Folder placement percentage by mailbox provider, from live seed-list tests.
Composite per-domain and per-IP score with trend lines and alerts.
Live hard-bounce and complaint rates against the thresholds that matter.
Continuous RBL monitoring for your IPs and domains, with listing alerts.
DKIM, SPF, DMARC, and BIMI status, re-verified on a schedule.
Ramp schedule and current per-IP capacity as a new pool warms.
Parsed aggregate reports — who sends as you, and where alignment fails.
Accepted-by-receiver rate, broken out by domain and by stream.
Authenticate a domain in minutes, send through dedicated IPs we manage, and watch inbox placement on the same dashboard. Resend-compatible API — change the base URL and you're sending.
Postmark-grade deliverability. Resend-grade DX. On infrastructure you control.