SieveSieve vs a typical email verifier
We built this table, so assume bias. That is exactly why the rows where a plain, price-first tool beats us are still in it. Where a cheaper tool wins, we say so.
Price
Sieve is $1.69 to $5.00 per 1,000, and credits never expire.
Most verifiers price in the same range or higher, and their credits often expire. A few bulk-only tools go lower on raw price, but you get a plain yes or no, not a verdict receipt with the evidence. On Pro that works out to $1.93 per 1,000 at $29/mo for 15,000.
See full pricingWhat you actually get
| Capability | Sieve | A typical verifier |
|---|---|---|
Live SMTP mailbox verification Table stakes: most verifiers do this. | ||
Verdict receipt on every address The MX host that answered and the SMTP reply code, in the API response. | Usually just a plain yes or no | |
Catch-all confidence score (0 to 100) Built from the real probe evidence, not a single flag. | Usually a binary catch-all flag | |
Detects full and disabled mailboxes From the live SMTP reply code, shown on the receipt. | Rarely surfaced | |
Pre-send risk verdict Fuses the recipient verdict with YOUR sending domain's SPF, DKIM and DMARC health into one send, caution or suppress call. | ||
Single-tenant, self-hosted privacy Your lists never leave our EU-jurisdiction box, are never resold, and never train a pooled cross-customer dataset. | Usually multi-tenant cloud | |
AI contact finder | ||
Absolute cheapest price per 1,000 We are honest: a bulk-only tool with no receipts can undercut us on raw price. | No, some price-first tools are cheaper | |
Free tier | Unlimited DNS checks + 100 live SMTP a month | Usually trial credits only |
How most verifiers behave, summarized from public product docs, June 2026. One caveat that applies to everyone, us included: free-mail providers (Gmail, Yahoo, Outlook, iCloud) block mailbox probing, so no verifier can truly SMTP-verify those addresses, whatever the marketing says.
Judge us before you pay anything
Grade your sending domain's deliverability free: MX, SPF, DKIM, DMARC, blacklists. No signup.
Then verify a list with receipts
Unlimited DNS checks plus 100 live SMTP verifications a month, free. Every paid verdict ships with its evidence.