Bot Anomaly Detection and Email Verification run together as a single action — near-duplicate clustering, structural risk scoring, and mailbox-level deliverability, all in one /v1/emails response. No per-request toggles: one credit weight per screening covers everything.
Bot-enumerated and multi-accounting signups get grouped by fuzzy-matching handles as they arrive — the bigger the cluster, the higher the risk.
Every address is scored on structure + cluster size and resolved to allow, verify, or review. Tune the thresholds per list.
Scope detection to a specific list so duplicates are only evaluated against the right cohort. Per-list tuning knobs.
Integrate in minutes with a scoped API key. Strict per-tenant isolation on every layer — your data never mixes.
Bucketed, windowed matching keeps detection fast even with millions of addresses per tenant.
Four optional workspace features that plug directly into your detection flow. Pro plans bundle some free; everything stacks on a Stripe-billed slider with pro-rated upgrades and downgrades.
In-house DNS checker scores every sender and recipient domain you ingest. Surfaces as a per-record badge so you can flag mismatched / unprotected senders before they cause deliverability damage. Bundled free with Pro plans.
Send a test from your production sender to a seed list — we report inbox vs spam vs missing per ESP (Gmail / Yahoo / Outlook). 30/60/90-day reputation trend shows whether your deliverability is improving or regressing. Pairs naturally with Warmup — diagnose with Inbox Placement, fix with Warmup.
Connect 1, 10 or 50+ sending mailboxes (Gmail / Microsoft / SMTP) and we auto-warm them via partner send/reply loops. Reputation 0-100 per ESP (Google / Microsoft / Other), per-mailbox health-check, optional Pro / Max content tuning. The stepping stone to good Inbox Placement scores — most "we land in spam" problems are mailbox-reputation problems before they're domain problems. IP-level warmup is on our near-term roadmap.
Look up any number's country, carrier, and line type (mobile / VoIP / toll-free / fixed). Cache-first — repeat lookups of the same number are free. Single + bulk modes.
50+ industry blacklists checked on every domain you ingest. Hit count + listing names land on the matching Domain Health snapshot so deliverability problems surface before they land in production traffic.
SPF / DKIM / DMARC checkers and a content spam-scorer. Same engines that power the in-app Domain Health and Inbox Placement add-ons — exposed without an account so you can sanity-check a domain in seconds.
No black box. Follow the real path a team takes to wire up SieveGuard — every endpoint, payload and event below is exactly what you'll use.
Register and your workspace starts on a 3-day trial with 500 shared credits — no card. Credits are spent as you go across detection, verification, blacklist, phone and domain health.
Create a key under API keys. You see the full secret exactly once — we store only its hash. Keys start with sk_ and can carry an expiry.
Send up to 1,000 addresses to /v1/emails. Each returns an action — allow, verify or review — with a score, the reasons, its duplicate cluster and a deliverability verdict.
Register an endpoint and choose events. Every delivery is signed with X-Sieve-Signature (HMAC-SHA256) and retried with backoff — so you can trust it and replay it.
Point events at Slack, email or Intercom per channel, filtered by disposition. Plus a Monday AI digest per workspace — detection, domain health and warmup in one email.
Everything the API does has a home in the portal: submit and score in the Console, clear flagged sign-ups in the Review queue, dig through Records and Clusters, and watch Analytics, Domain health and API activity.
Each feature has its own step-by-step story — what it does under the hood, and the result you're after.
Clustering, scoring and the mailbox check — the one call every signup runs.
SPF / DKIM / DMARC / MX scored on every sending domain.
Seed tests showing inbox vs spam vs missing, per ESP.
Auto-warm sending mailboxes to build ESP reputation.
Carrier, line type and reachability at signup.
90+ DNSBLs watched on every domain you ingest.
One login, every client workspace. Volume discounts are agreed 1-on-1 — we set a tier ladder for your agency over a short call and demo, then it auto-applies to every client subscription and grows with your roster.
Join the affiliate program and earn commission on every business you send our way — on both monthly and yearly plans, for a full year. Transparent tracking, no caps on how many clients you bring.
Create a workspace, generate an API key, and start sending addresses.